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1. What is the relation between spontaneous and stimulated emission?
2. Explain in physical terms the origin of the selection rules.
3. Do all atoms pf a certain species take the same time to make a transition between a certain pair of levels?
An electron is held 2.10cm from a vertically aligned infinite charged plane and then released from rest. What is the surface charge density of the infinite plane
The drill used by most dentists today is powered by a small air-turbine that can operate at angular speeds of 361000 rpm. Calculate the angular acceleration produced by the drill
A geothermal power plant uses geothermal water extracted at 160oC at a rate of 440 kg/s as the heat source and produces 22 MW of net power.
Diffraction also occurs with sound waves, What isthe angle between the two first-order diffraction minima
A 100N sign is supported by two cables that are attached to two cables, attached to two buildings. The cables make an angle of 30 degrees with the top of building A and 60 degrees with the top of building B. Find the magnitude of the force exerted..
A child sits 1.75 m from the center of a rotating merry-go-round that makes one complete revolution (spin) in 2.58 seconds. What is the child's acceleration
A 1500 kilogram wrecking ball hangs from a 20 meter long cable. Determine by how much has the gravitational potential energy of the ball changed
A 369 g ball moving at -27 m/s is hit by a bat. The ball moves in the opposite direction at 35 m/s. How long did it interact with the bat if the average force was 278 N
A glass block (n = 1.56) is immersed in a liquid. A ray of light within the glass hits a glass-liquid surface at a 69.0° angle of incidence. What is the smallest possible refractive index for the liquid
Take a spring and cut it in half. What can you say about the spring constant of the smaller springs relative to the original one? Explain
a projectile is launched on the earth with a certain initial velocity and moves without air resistance. another
a lead wire of cross-sectional area 0.980 mm2 is at a temperature of 2.00 k and carries a current of 0.490 a. a find
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