AIPMT 2011 Mains Mock Test

Threshold frequency for a metal is $3.3\times 10^{14}\text{Hz}$. If light of frequency $8.2\times 10^{14}\text{Hz}$ is incident, the cut-off voltage is nearly:

An electron in $\text{H}$ -atom jumps from $n$ to ground state. Work function of material is $2.75\text{eV}$ and stopping potential is $10\text{V}$. The value of $n$ is:

For the potential $V$ shown in the figure (triangular wave), the $r.m.s.$ value is:

A particle of mass $M$ is at the centre of a spherical shell of mass $M$ and radius $a$. Gravitational potential at distance $a/2$ from centre is:

Two particles oscillate with same frequency and amplitude. They pass each other moving in opposite directions when displacement is half the amplitude. The phase difference is: