Answer:
1. λ = 2.626 x 10⁻⁷ m = 262.6 nm
This wavelength is not in visible range. It lies in Ultra Violet Region.
2. λ = 5.546 x 10⁻⁷ m = 554.6 nm
This wavelength is in visible range.
Explanation:
The binding energy of in photoelectric effect is also known as work function. The formula for this is given as follows:
Binding Energy = Work Function = hc/λ
λ = hc/Work Function --------------- equation (1)
where,
h = Plank's Constant = 6.626 x 10⁻³⁴ J.s
c = speed of light = 3 x 10⁸ m/s
λ = longest wavelength capable of ejecting electron = ?
(1)
Here,
Work Function = (4.73 eV)(1.6 x 10⁻¹⁹ J/1 eV) = 7.568 x 10⁻¹⁹ J
Therefore,
λ = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(7.568 x 10⁻¹⁹ J)
λ = 2.626 x 10⁻⁷ m = 262.6 nm
This wavelength is not in visible range. It lies in Ultra Violet Region.
(2)
Here,
Work Function = (2.24 eV)(1.6 x 10⁻¹⁹ J/1 eV) = 3.584 x 10⁻¹⁹ J
Therefore,
λ = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(3.584 x 10⁻¹⁹ J)
λ = 5.546 x 10⁻⁷ m = 554.6 nm
This wavelength is in visible range.
"If we increase the frequency of transverse waves on a string, what happens to the period of oscillation of any given point on the string?"
Answer:
Period will decrease
Explanation:
Because from the relationship
T = K/f
Period inversely proportional to frequency so as frequency increase period decrease and vice versa
Why won’t a magnet help you separate a mixture of salt and water
Answer: nor are magnetic
Answer: Neither salt or water are magnetized.
Explanation: The best way to separate salt and water is to boil the mixture. If you wanted to use a magnet you would need something magnetized, like iron fillings.
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Which of the following quantities is NOT a vector quantity?
A. 926 m to the north
B. 5.2 m/s to the west
C. 46 m down
D. 12.3 m/s faster
Answer:
D is not the a vector quantities
Since the noble gases are stable (VERY unreactive), oxygen would like to look like one in terms of the number and arrangement of its electrons. What would the atom of oxygen have to do to its electrons in order to look like neon?
Answer:
oxygen gains two electron to attain electron configuration like neon. Oe-²
Explanation:
what would most likely cause the future accelaration of the expansion of the univers
Answer: radiation from the Sun the existence of background radiation the continued existence of dark energy light shifts identified by the Doppler effect.
Explanation:
do amps in circuit change if something is removed from the circuit for example:
There is two lamps in a circuit if one is removed would the current in the circuit change
Answer:
Yes, the current will change if one light bulb is removed from the circuit.
Explanation:
Recall that each light bulb possess in fact resistance, and electric energy is converted into light and heat as current circulates through each. therefore, removing one light bulb will change the total resistance of the circuit , thus affecting the current through it according to Ohm's Law.
As a free falling object rises, the velocity is directed?
Answer:The acceleration of all free-falling objects is directed downwards. A rising object slows down due to the downward gravity force
Explanation:
As a free falling object rises, velocity is directed downwards.
Freely fall:Free fall is a special case of projectile motion. In a free fall direction is always downward and initial velocity of the object is null.
The zero initial velocity of the object signifies that falling object was dropped rather than thrown downwards. Freefall is a special case of motion with constant acceleration.
Free fall is a state of body which moves freely in any manner in presence of gravity. Freely falling objects do not have air resistance. A freely falling object accelerate at a rate of 9.8 m/s2.
There are different formulas for freefall such as:
v2= 2ghv= gth= 1/2 gt2Therefore, As a free falling object rises, velocity is directed downwards.
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If you run at a constant speed of 7.5 m/s, how long does it take for you to finish a 100 m race ? show your work
Answer:
13s
Explanation:
(7.5m/s)(t)=(100m)
t=(100/7.5)s=13s
Which best describes those that can pass through? They are concentrated. They are soluble. They are diluted. They are heated.
Answer:
B
Explanation:
SmARt
The term “solubility” describes a property that describes a substance's capacity to dissolve in a solvent. It is calculated as the highest solute concentration that can be dissolved in a solvent at equilibrium. A saturated solution is the term used to describe the outcome. Thus, option B is correct.
What best describes those that can pass through?The solute is the substance that dissolves. The solvent is the material that dissolves it. Solvents and solutes can exist in any material state. Water is a strongly polar substance, making it a very good solvent for many solutes.
Because they share chemical characteristics with the plasma membrane, some substances can pass through it. Which definition best sums up those who can pass through? They focus intensely. They dissolve easily.
Therefore, The maximum amount of a chemical that will dissolve in a given amount of solvent at a given temperature is referred to as its solubility.
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A cheetah can run at a top speed of 85 mi/h . What is the distance it runs in half an hour?
Answer:
42.5 miles
Explanation:
To find the answer we need to know the formula:
Distance = speed x time
85 x 0.5 = 42.5 miles
Hope this helps!
______ Daltons model (it was no longer a solid, indivisible sphere)
Answer:
John
Explanation:
John Dalton is the scientist with the atomic model.
Answer:
John Daltons atomic model
Explanation:
If we put negative charge between two similar positive charges then what is it's equilibrium? And how?
Your question has been heard loud and clear.
Well it depends on the magnitude of charges. Generally , when both positive charges have the same magnitude , their equilibrium point is towards the centre joining the two charges. But if magnitude of one positive charge is higher than the other , then the equilibrium point will be towards the charge having lesser magnitude.
Now , a negative charge is placed in between the two positive charges. So , if both positive charges have same magnitude , they both pull the negative charge towards each other with an equal force. Thus the equilibrium point will be where the negative charge is placed because , both forces are equal , and opposite , so they cancel out each other at the point where the negative charge is placed. However if they are of different magnitudes , then the equilibrium point will be shifted towards the positive charge having less magnitude.
Thank you
Answer:
it will be positive
Explanation:
For physics show-and-tell, you want to impress the class by sipping water through a long straw. If you hold the straw vertically, determine the length of the longest straw that you could, in principle, drink from in this manner._____ mAdditional Materials Show My Work (Optional)
Answer:
10.31 m
Explanation:
To find the result you have to use the formula: h = p / eg.
Where: e = 1000Kg/m^3 g=9.8m/s^2 p= 1.01 * 10^5 Pa
The calculation will be:
h= 1.01 * 10^5 / (1000kg/m^2) * (9.8m/s^2)
h= 10.31 m
Which statements describe what is occurring at t=5 seconds? Check all that apply
Answer: The object changed directions
The object sped up
Explanation:
17
The diagram below shows an ideal transformer which is supplied with an
alternating voitage of 240V and a current of 1A.
If the secondary current is 5A, what is the secondary voltage?
A
1400V
B
1200V
C
240V
D48V
Answer:
I think the answer is B, I am not for sure
10m= (5.0) + (.5)(9.8)(5.0)
If three forces are equal and their resultant force is zero, then measure of its internal angle is: a)0° b)90° c)60° d)45°
Answer:
60
Explanation:
As the forces are equal and resultant force is 0 , it forms an equilateral triangle and equilateral triangle has an angle of 60 degrees
Hope this Helps U...,
thank u
What is the relationship between power and bulb brightness (intensity)?
Explanation:
Power of an electrical appliance is given by :
P = VI
Here,
V is the voltage
I is the current
From the above formula for power, we find that power is directly proportional to the voltage of the circuit. If a single bulb is there in the circuit, increasing the voltage of the bulb will increase its power, which in turn increases its bulb brightness or intensity.
[9]
(b) A billiard ball B at rest is struck by an identical ball A moving with a speed of 10 m/s along
the positive y-axis. After the collision, the two balls move off in directions that are perpendicular
to each other, with ball A making 15° with the positive y-axis. Find the final velocities (Direction
and magnitude) of both balls. [16]
Answer:
9.66 m/s 15° with +y
2.59 m/s 75° with +y
Explanation:
Momentum is conserved in the y direction.
mu₁ + mu₂ = mv₁ + mv₂
u₁ + u₂ = v₁ + v₂
10 m/s + 0 m/s = v₁ cos 15° + v₂ cos 75°
10 = v₁ cos 15° + v₂ cos 75°
Momentum is conserved in the x direction.
mu₁ + mu₂ = mv₁ + mv₂
u₁ + u₂ = v₁ + v₂
0 m/s + 0 m/s = v₁ sin 15° − v₂ sin 75°
0 = v₁ sin 15° − v₂ sin 75°
v₁ sin 15° = v₂ sin 75°
v₂ = v₁ sin 15° / sin 75°
Substitute.
10 = v₁ cos 15° + (v₁ sin 15° / sin 75°) cos 75°
10 = v₁ cos 15° + v₁ sin 15° / tan 75°
10 = v₁ (cos 15° + sin 15° / tan 75°)
v₁ ≈ 9.66 m/s
v₂ ≈ 2.59 m/s
a 900 w microwave generator in an oven generates energy quantra of frquenecy 2560 mhz how many energy
Answer:
1.6E-32J
Explanation:
Using
Energy= power x time
And E= hf
hf= Pt
t = hf/p= 6.6*10^-34x 2560*10^-3/900
= 18.7*10^-37s
So E = pt
= 900 x 1.8E-37
1.6x10^-32J
A construction worker 40.0 m above the ground drops his hammer. How long does his shouted warning take to reach the ground if the speed of sound under these conditions is 335 m/s?
Answer:
0.239secondsExplanation:
Using the formula for calculating the distance between the worker (source) and the reflector (ground) expressed as shown:
2x = vt where:
x is the distance between the source and the reflector
v is the velocity of sound in air
t is the time taken by is shout warning to reach the ground
Given parameters
x = 40.0m
v = 335m/s
Required
The time taken by is shout warning to reach the ground
Using the formula 2x = vt
t = 2x/v
t = 2(40)/335
t = 80/335
t = 0.239seconds
Hence it will take 0.339 seconds for his shout warning to reach the ground
explain the different methods that can be used to model the motion of an object.
In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time. The motion of a body is observed by attaching a frame of reference to an observer and measuring the change in position of the body relative to that frame with change in time. The branch of physics describing the motion of objects without reference to its cause is kinematics; the branch studying forces and their effect on motion is dynamics.
Answer:
You can describe the motion of an object by its position, speed, direction, and acceleration. An object is moving if its position relative to a fixed point is changing. idk if this helps.
Explanation:
A proton is located at <3 x 10^-10> m. What is r, the vector from the origin to the location of the proton
Complete Question
A proton is located at <3 x 10^{-10}, -5*10^{-10} , -5*10^{-10}> m. What is r, the vector from the origin to the location of the proton
Answer:
The vector position is [tex]\=r=<3*10^{-10}i-5*10^{-10}j -5*10^{-10}k>[/tex]
Explanation:
From the question we are told that
The position of the proton is [tex]<3 * 10^{-10}, -5*10^{-10} , -5*10^{-10}> m[/tex]
Generally the vector location of the proton is mathematically represented as
[tex]\= r = <xi + yj + zk>[/tex]
So substituting values
[tex]\=r=<3*10^{-10}i-5*10^{-10}j -5*10^{-10}k>[/tex]
A wooden artifact is found in an ancient tomb. Its carbon-14 14 6 C activity is measured to be 55.0% of that in a fresh sample of wood from the same region. Assuming the same amount of 14C was initially present in the artifact as is now contained in the fresh sample, determine the age of the artifact (in years)
Answer:
[tex] t = 4.942\times10^{3}[/tex]
Explanation:
we know that
[tex]t =-\frac{ln\frac{R}{R_0} }{\lambda}[/tex]
the symbols have their usual meaning
Also,
[tex]t=-T_{1/2}\frac{ln\frac{R}{R_0} }{ln2}[/tex]
now plugging the values we get
[tex]t=-5730\frac{ln(0.55) }{ln(2)}[/tex]
[tex] t = 4.942\times10^{3}[/tex] years
A spherically spreading EM wave comes from an 1800-W source. At a distance of 5.0 m, what is the intensity, and what is the rms value of the electric field?
Answer:
The intensity of the EM wave is 5.729 W/m²
The rms value of the electric field is 46.452 V/m
Explanation:
Given;
power of the electromagnetic wave, P = 1800 W
The intensity of light is given by;
I = P / A
Where;
A is the surface area of the sphere = 4πr²
A is the surface area of the sphere = 4π(5)²
A is the surface area of the sphere = 314.2 m²
The intensity is calculated as;
I = P / A
I = (1800) / (314.2)
I = 5.729 W/m²
The rms value of the electric field is given by;
[tex]E_{rms} = \sqrt{\frac{I}{c \epsilon _o}}\\\\E_{rms} = \sqrt{\frac{5.729}{(3*10^8)( 8.85*10^{-12})}}\\\\E_{rms} = 46.452 \ V/m[/tex]
A fish in an aquarium with flat sides looks out at a hungry cat. To the fish, the distance to the cat appears to be
Answer:
flat
Explanation:
A student performed an experiment with a metal sphere. The student shot the sphere from a slingshot and measured its maximum height. Six different trials were performed with the sphere being shot at a different angle from the horizontal for each trial. What is the independent variable
The correct answer is Launch angle
Explanation:
The Independent Variable can be easily identified because this is the factor or variable the researcher modifies. In this case, this term applies to the angle because as part of the experiment the student changes the angle multiple times to test how the maximum height changes. Moreover, the maximum height would be the dependent variable as it is the main factor and it changes or depends on other variables including the angle. Thus, it can be concluded the independent variable is the launch angle or the angle from which the ball is launched.
Two positive point charges, each with charge q, separated by a distance d, repel each other with a force of magnitude 20 N. What is the magnitude of the force between two positive point charges of magnitude 11.11 q, separated by a distance 2.5 d in units of N
Answer:
The value is [tex]F_2 = 395 \ N[/tex]
Explanation:
From the question we are told that
The magnitude of the charge of each positive charge for the first case is [tex]q_1 = q_2 = q[/tex]
The distance between the charges for the first case is [tex]d[/tex]
The force between the charges for the first case is [tex]F = 20 \ N[/tex]
The magnitude of the charge of each positive charge for the second case is [tex]q_1 = q_2=11.11q[/tex]
The distance between the charge for the second case is [tex]2.5d[/tex]
Generally for the first case the force between the charge is mathematically represented as
[tex]F_1 = \frac{k * q^2 }{d^2}[/tex]
Where k is the Coulomb constant with value [tex]k = 9*10^{9} \ kg\cdot m^3\cdot s^{-4} \cdot A^{-2}.[/tex]
So
[tex]20= \frac{k * q^2 }{d^2}[/tex]
Generally for the second case the force between the charge is mathematically represented as
[tex]F_2 = \frac{k * (11.11q)^2}{(2.5d)^2}[/tex]
[tex]F_2 = \frac{k * 11.11^2 *q^2}{2.5^2d^2}[/tex]
=> [tex]F_2 = \frac{11.11^2}{2.5^2} F_1[/tex]
=> [tex]F_2 = \frac{11.11^2}{2.5^2} * 20[/tex]
=> [tex]F_2 = 395 \ N[/tex]
White light is shining on the surface of a soap bubble, which has the same index of refraction as water. Find the minimum thickness, in nanometers, of a soap bubble which appears red (a wavelength of 725 nm) when the light is perpendicular to its surface.
Answer:
The minimum thickness is [tex]t = 1.363 *10^{-7} \ m[/tex]
Explanation:
From the question we are told that
The index of refraction of the bubble is [tex]n = 1.33[/tex] = index of refraction of water
The wavelength is [tex]\lambda =725nm = 725 *10^{-9} \ m[/tex]
Generally the condition for constructive interference is mathematically represented as
[tex]2 * t = [m + \frac{1}{2} ] * \frac{\lambda }{n}[/tex]
Now t is the thickness and at minimum t, m(order of maximum ) = 0
So
[tex]2 * t = [0 + \frac{1}{2} ] * \frac{ 725 *10^{-9} }{ 1.33}[/tex]
=> [tex]t = 1.363 *10^{-7} \ m[/tex]
mass is tied to spring and begins periodically . the distance between its highest and its lowest position is 48cm. what is the amplitude of the vibration
Answer:24cm
Explanation: