A. zero
B. hv/c2
C. hv/c
D. c2/hv
Modern Physics
In Davisson-Germer experiment the diffracted proton from crystal shows______________?
A. Particle property
B. Wave property
C. Light property
D. Quantum property
Einstein’s photoelectric equation is given by_______________?
A. 1/2 mvmax2=hf+Φ
B. 1/2 mvmax2-hf = Φ
C. 1/2 mvmax2=hf-Φ
D. All of above are correct
A photon of wavelength 900nm behaves like a particle of mass______________?
A. 5.53 x 10-36kg
B. 0 kg.
C. 2.46 x 10-36kg
D. 1.84 x 10-44kg
Mark the wrong statement ?
A. a frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference
B. an un-accelerated frame of reference is called an inertial frame of reference
C. all the frames of reference in uniform rectilinear motion are equivalent
D. Newtons laws of motion are valid in an accelerated (non inertial) frame of reference
Select an alternative from of uncertainly principle from the following_______________?
A. ∆E = h/m∆c(1-cosθ)
B. ∆E . ∆t = h
C. mc2 = hv
D. Any of above
Which one of the following has the largest energy content ?
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)
Rest mass of a photon is________________?
A. infinite
B. zero
C. very small
D. 1.67 x 10-27 kg
Tick the right statement?
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 photon is________________?
A. A unit of energy
B. A positively charged particle
C. A quantum of electromagnetic radiation
D. A unit of wavelength
