In Davisson-Germer experiment the diffracted proton from crystal shows______________?
(A) Particle property
(B) Wave property
(C) Light property
(D) Quantum property
The velocity of a particle of mass m of de-Broglie wavelength λ is______________?
(A) v = 3 ×× 106 ms-1
(B) v = 2 ×× 10 ms-1
(C) v = 2 ×× 6 ms-1
(D) v = 2 ×× 106 ms-1
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
If a photon is reflected from the mirror then the change in momentum of each photon is_______________?
(A) Zero
(B) Double
(C) Half
(D) 1
If the wavelength of incident radiation is increased in photoemission then_________________?
(A) The maximum kinetic energy of the photoelectrons increases
(B) The minimum kinetic energy of the photoelectrons decreases
(C) The minimum kinetic energy of the photoelectrons increases
(D) The average kinetic energy of the photoelectrons decreases
In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron_______________?
(A) Becomes double
(B) Remains same
(C) Becomes half
(D) First increases then decrease because of the curvilinear graph
The diameter of a lens is called________________?
(A) focal length
(B) principal axis
(C) aperture
(D) radius of curvature
A lens which converges a beam of parallel rays to a point is called______________?
(A) diverging (or concave) lens
(B) converging (or convex) lens
(C) plano concave lens
(D) plano convex lens