Quantum Mechanics Answers

Q. Find frequency, wavelength and momentum of photon whose energy is equal to rest energy of electron.
Q. Photons of wavelength of 2.17pm are incident on free electron (a) find wavelength of photon that is scattered at 350 from the incident direction.

Q. The x-rays with λ= 100pm are scattered from a carbon target. The scattered radiation is viewed at 900. What K.E is imparted to recoiling electron?
Q. A particular x-ray photon has wavelength of 41.5pm. Calculate photon (a) energy, (b) frequency, (c) momentum.

Q. Show that energy E of a photon having wavelength λ can be written as E= (1240ev/ λ)nm.
Q. The energy needed to remove an electron from metallic sodium is 2.28ev. Does sodium show photo electric effect for red light having wavelength λ= 678 nm. What is cut off wavelength for photoelectric emission from sodium?

Q. If a work function for the metal is 1.85ev. What would be stopping potential for light having wavelength 410 nm?

Q.The light from a highway sodium lamp has wavelength 589 nm. What is energy in ev of photon emitted form lamp?

Q. Find frequency, energy and momentum of a photon having wavelength of 46 pm.

Q. An atom absorbs a photon having wavelength of 375 nm and immediately emits another photon having wavelength of 580 nm. What was the net energy absorbed by atom in this process?

Q. The emission of photoelectorns due to incident photons on the sodium surface stopped when a stopping potential of 4.2V is applied. Find wavelength of incident photons.

Q. Find work function for a silver surface for which the threshold frequency of incident light is 1.1х1015 Hz.

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