Dual nature of radiation is shown by
Diffraction and reflection
Refraction and diffraction
Photoelectric effect alone
Photoelectric effect and diffraction
The curve drawn between velocity and frequency of photon in vacuum will be a
Photo-electric effect can be explained by
Which one of these is non-divisible
Both the nucleus and the atom of some element are in their respective first excited states. They get de-excited by emitting photons of wavelengths $\lambda _N,\,\lambda _A$ respectively. The ratio $\frac{{{\lambda _N}}}{{{\lambda _A}}}$ is closest to