NEET 2021 Question Paper Mock Test

An electromagnetic wave of wavelength $\lambda$ is incident on a photosensitive surface of negligible work function. If $m$ mass is of photoelectron emitted from the surface has de-Broglie wavelength ${\lambda }_d$, then:

Match Column-I and Column-II and choose the correct match from the given choices.

A nucleus with mass number $240$ breaks into two fragments each of mass number $120$. The binding energy per nucleon of unfragmented nuclei is $7.6\text{MeV}$ while that of fragments is $8.5\text{MeV}$. The total gain in the Binding Energy in the process is:

A parallel plate capacitor has a uniform electric field $\vec{E}$ in the space between the plates. If the distance between the plates is $d$ and the area of each plate is $A$, the energy stored in the capacitor is: (${ϵ}_0=\text{permittivity of free space}$)

Find the value of angle of emergence from the prism. Refractive index of the glass is $\sqrt{3}$.