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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?
7 an x-ray tube is operating with energy of 16 keV the produced x-rays photon strike a target and are compton-scattered at an angle of 45 degrees, what is the energy of the scattered x-ray photon in ev
A 15.0 kg box is pushed up an 8.00 m long frictionless incline inclined at an angle of 30.0 degrees above the horizontal in 4.2 seconds. Find the average power required
An ideal transformer's primary has 2000 turns and secondary has 50 turns. The primary is connected to a source of 120 V, Find the current in the secondary
A tuning fork with a frequency of 440 Hz is held above a resonance tube that is partially full with water. Assuming that the speed of sound in air is 342 m/s, for what three smallest heights of the air column will resonance occur?
You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between your feet and the ice. calculate with what speed do you and the ball move afterwards
A small plastic ball of mass m = 1.50 g is suspended by a string of length L = 24.5 cm in a uniform electric field, what is the net charge on the ball
Compare the noise power calculated in Part (a) with the additional noise power received if the moon is in the antenna beam with a filling factor of 0.3
A pulley, with a rotational inertia of3.2×10-3 kg m2 about its axleand a radius of 6.0 cm, is acted on by a force appliedtangentially at its rim. The force magnitude varies in time as F =0.58t + 0.24t2, where F is in newtons if t is given insecond..
A precious-stone dealer wishes to find the specific heat capacityof a 0.040-kg gemstone. What is the specific heat capacity of the specimen
The position of a particle is given by x = 3.1 cos t, where x is in meters and t is in seconds. Discover the maximum speed and maximum acceleration of the particle.
If an airplane has airspeed 100 km/hr southwest but is traveling 140 km/hr south relative to the ground
A farsighted boy has a near point at 2.2 m and requires eyeglasses to correct his vision. Find the correct choice of lens power for eyeglasses
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