A beam of monochromatic green light is diffracted by a slit of width 0.500 mm. The diffraction pattern forms on a wall 2.06 m beyond the slit. The distance between the positions of zero intensity on both sides of the central bright fringe is 5.10 mm. Calculate the wavelength of the light.
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Use the slope of the graph of τ vs. square root of L to calculate g and its uncertainty. δg = 2g δ (slope) Show your work
we should use m2=2buy/sqrtof y but how?!!
http://www.pa.msu.edu/courses/2015summer/PHY251/labfiles/practical2.pdf
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A 11.9-kg object oscillates at the end of a vertical spring that has a spring constant of 1.80 ✕ 104 N/m. The effect of air resistance is represented by the damping coefficient
b = 3.00 N · s/m.
(a) Calculate the frequency of the damped oscillation.
Hz
(b) By what percentage does the amplitude of the oscillation
decrease in each cycle?
%
(c) Find the time interval that elapses while the energy of the
system drops to 3.00% of its initial value.
s
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Describe the working principle of a Silicon Solar Cell.
a) How the solar cell generates electricity? Describe n/p doping, depletion region concepts.
b) Describe the meaning of Fill Factor. How do you calculate the fill factor? What can be the reasons of bad fill factor behavior?
c) A solar panel has an area of 0.5 m2 and illuminated with an irradiation of 1000W/m2 . Its open circuit voltage is 24 V and Short Circuit Current is 5.5 A. If the FF of the solar panel is 78%, then calculate the efficiency of the solar panel.
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A body weighing 10 pounds forces hangs from a spring with constant 4/5 lb / ft. The medium where the body moves it offers a resistance force to movement that is numerically equal to its instantaneous speed. If the weight is released 5/3 feet above your balance position with a downward speed of 6 feet per second, determine the position the lower the object reaches. Consider negative downward and positive upward magnitudes
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A wave pulse travels down a slinky. The mass of the
slinky is m = 0.89 kg and is initially stretched to a length L =
6.6 m. The wave pulse has an amplitude of A = 0.28 m and takes t =
0.414 s to travel down the stretched length of the slinky. The
frequency of the wave pulse is f = 0.45 Hz.
1)
What is the speed of the wave pulse?
2)
What is the tension in the slinky?
3)
What is the average speed of a piece of the slinky as a complete wave pulse passes?
4)
What is the wavelength of the wave pulse?
5)
Now the slinky is stretched to twice its length (but the total mass
does not change).
What is the new tension in the slinky? (assume the slinky acts as a
spring that obeys Hooke’s Law)
6)
What is the new mass density of the slinky?
7)
What is the new time it takes for a wave pulse to travel down the
slinky?
8)
If the new wave pulse has the same frequency, what is the new
wavelength? (m)
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In a 250-word post, choose one or more of the topics listed below. to write about, include an active hyperlink to your resource...
Look for an article or news story/video that relates to one or more of the following topics:
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A 0.077-nm x-ray is incident on a stationary electron. A scattered photon is observed at 102°. Find the energy of the scattered photon E'γ= keV and its wavelength λ'= nm. Find the kinetic energy of recoiled electron K= keV. Find the speed of recoiled electron as a fraction of speed of light: v/c= .
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If the coefficient of static friction is 0.60, and the same ladder makes a 46° angle with respect to the horizontal, how far along the length of the ladder can a 55.0-kg person climb before the ladder begins to slip? The ladder is 7.5 m in length and has a mass of 21 kg.
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A 621-kg elevator starts from rest and moves upward for 3.20 s with constant acceleration until it reaches its cruising speed, 1.65 m/s.
(a) What is the average power of the elevator motor during this
period?
hp
(b) How does this amount of power compare with its power during an
upward trip with constant speed? (Give the power during an upward
trip with constant speed.)
hp
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A 1,000-kg car moving east at 90 km/h collides head-on with a 1,500-kg car moving west at 50 km/h, and the two cars stick together. (a) Which way does the wreckage move and with what initial speed? (b) How much KE is lost in the collision?
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A soap bubble is 95 nm thick and illuminated by white light incident perpendicular to its surface.
The longest wavelength in nm which is constructively reflected, assuming soap has the same index of refraction as water (n = 1.33) is equal to 505.4 nm.
Draw a diagram of the mediums showing where, if any, a phase change occurs.
State whether you are looking for constructive of destructive interference.
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Your younger brother is supposed to mow the lawn using a push mower. He reasons from Newton's third Law that the mower will push back with the same force he exerts on the mower; therefore nothing will move and attempting to mow the lawn is pointless. What is wrong with his reasoning?
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Consider our graphical analysis of the bound states in a finite square well of depth V0 and width a. Determine
a) The condition on V0 and a that there is at most one bound state in the problem.
b) The condition on V0 and a that there is at most four bound states in the problem.
c) Suppose the potential parameters are such that the third bound state is just barely bound. What can you say about the binding energy of the first and second bound states?
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Construct the explicit form of the lowest three eigenfunctions of the harmonic oscillator.
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