The approximate wavelength of a photon of energy $2.48 \,eV$ is ............ $\mathring A$.

Write the characteristics of a photon or how can a photon of electromagnetic radiation be represented?

If we express the energy of a photon in $KeV$ and the wavelength in $\mathring{A}$,then the energy of a photon can be calculated from the relation:

There are two sources of light,each emitting with a power of $100 \, W$. One emits $X$-rays of wavelength $1 \, nm$ and the other visible light at $500 \, nm$. Find the ratio of the number of photons of $X$-rays to the photons of visible light of the given wavelength.

The photoelectric effect can be understood on the basis of

Which of the following has a mass closest in value to that of the positron? $(1\;a.m.u = 931\;MeV)$