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10 Question-answer on particle nature of light 1.        Planck’s constant has the dimensions of (a)     Energy (b)    Mass (c)     Frequency (d)    Angular momentum Ans: ( d) 2.        A photon of frequency v has a momentum associated with it. If c is the velocity of light, this momentum is: (a)     Hv/c 2 (b)    Hvc (c)     v/c (d)    hv/c Ans: (d) 3.        the energy of the visible light is of the order of (a)     few eV (b)    few MeV (c)     Few keV (d)    1/1000eV Ans: (a) 4.        A metal surface is illuminated by the photons of energy 5eV and 2.5 eV respectively. The ratio of their wavelengths is: (a)     1:3 (b)    1:4 (c)     2:1...