Category: Modern Physics

A. ∆E = h/m∆c(1-cosθ)
B. ∆E . ∆t = h
C. mc2 = hv
D. Any of above

A. 103 photons of wavelength 2 pm (γ-rays)
B. 102 photons of wavelength 1nm (x-rays)
C. 106 photons of wavelength 50?m (infrared)
D. 106 photons of wavelength 200nm (UV)

A. infinite
B. zero
C. very small
D. 1.67 x 10-27 kg

A. no photo electronic emission takes place if the frequency of radiation however intense it may be is less than a certain critical value called threshold frequency
B. threshold frequency depends upon the nature of the metal surface
C. maximum energy of a photoelectron is a function of frequency rather than intensity of radiation
D. all of the above

A. A unit of energy
B. A positively charged particle
C. A quantum of electromagnetic radiation
D. A unit of wavelength

A. equal to its rest mass
B. double of its rest mass
C. infinite
D. zero

A. greater than one meter
B. less than one meter
C. one meter
D. a foolish question

A. Zero
B. Double
C. Half
D. 1

A. The angle of scattering is 90°
B. The angle of scattering is 60°
C. The angle of scattering is 180°
D. The angle of scattering is 0