JEE Main 2004 — Modern Physics

The manifestation of band structure in solids is due to

The binding energy per nucleon of deuteron $\left({ }_1^2 \mathrm{H}\right)$ and helium nucleus $\left({ }_2^4 \mathrm{He}\right)$ is $1.1 \mathrm{MeV}$ and $7 \mathrm{MeV}$ respectively. If two deuteron nuclei react to form a single helium nucleus, then the energy released is

The work function of a substance is $4.0 \mathrm{eV}$. Then longest wavelength of light that can cause photoelectron emission from this substance approximately

According to EInstein's photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal $\mathrm{V}_{\mathrm{s}}$ the frequency, of the incident radiation gives straight line whose slope

When p-n junction diode is forward biased

A radiation of energy $E$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is

A nucleus disintegrates into two nuclear parts which have their velocities in the ratio $2: 1$. The ratio of their nuclear sizes will be