Dual Nature of Radiation and Matter

A photoelectric effect supports quantum nature of light because :

A. There is a minimum frequency of light below which no photoelectrons are emitted.

B. The maximum kinetic energy of photo electrons depends only on the frequency of light and not on its intensity

C. Above thresold frequency even when the  metal surface is faintly illuminated, the photoelectrons leave the surface immediately

D. Electric charge of photoelectrons is quantized

In the above true statement is :-

Young's double slit experiment the amplitude of two sources are 3a and a respectively. The ratio of intensities of bright and dark fringe will be :-

When light of maximum wavelength 300 nm falls on a photoelectric emitter, photoelectrons are liberated. For another emitter however light of maximum wavelength 600 nm causes photoelectric emission. The ratio of work functions of first emitter to second emitter will be

A wire can be broken by a load of 20 kg-wt. The force required to break wire of same material with twice the diameter will be

de-Broglie wavelength of a proton and an electron is same. The ratio of kinetic energy of electron to that of proton is

Maximum wavelength of light source such that photoelectron can be ejected from material of work function 3 eV is

In a photoelectric experiment, frequency f = 1.5f₀ (f₀ : threshold frequency). If the frequency of light is changed to f/2, then photocurrent becomes (intensity of light has doubled)

de Broglie wavelength of proton = λ and that of an a particle is 2λ. The ratio of velocity of proton to that of a particle is:

When a metallic surface is illuminated with radiation of wavelength l, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2l, the stopping potential is  V . The threshold wavelength metallic surface is

Who discovered the concept of photon?