Q1:A beam of light of wavelength λa is incident on a metal surface and experimentally es- tablished to produce electrons with a maximum kinetic energy of Ka Joules. The longest wavelength of light capable of releasing electrons from the surface is? Q2:The diagram below shows the polarising angles of three polarising sheets. Unpolarised light traveling in the +z direction impinges on sheet 1, and then transmits through two
more sheets as shown, where sheet 2 has a polarisation angle θ with respect to that of sheet 1, and sheet 3 has a polarization angle at 90? to the polarisation angle of sheet 1.
Which of the following is incorrect?
A. the intensity after sheet 3 can increase when sheet 2 is inserted
B. the intensity after sheet 1 is half the incident light intensity
C. the intensity after sheet 3 is zero if θ = 0? or θ = 90?
D. the intensity after sheet 3 is always zero no matter what the value of θ
E. the intensity depends on the square of the wave amplitude
See
Q3:An X ray photon of wavelength λI = 2.35pm is directed along the x -axis and collides with a stationary atom producing a scattered photon at an angle of π/2 radians to the x -axis and a scattered electron. Assuming no momentum was transferred to the atom, the scattered electron has momentum of magnitude: