Two identical photocathodes receive light of frequencies ' $f 1$ ' and ' $f_2$ '. The velocity of the photoelectrons of mass ' $m$ ' emitted are respectively ' $\mathrm{v}_1$ ' and ' $\mathrm{v}_2$ '. Then the correct relation is ( $\mathrm{h}=$ Planck's constant)
$\quad v_1-v_2=\left[\frac{2 h}{m}\left(f_1-f_2\right)\right]^{\frac{1}{2}}$
$\quad v_1+v_2=\left[\frac{2 h}{m}\left(f_1+f_2\right)\right]^{\frac{1}{2}}$
$v_1^2-v_2^2=\frac{2 h}{m}\left(f_1-f_2\right)$
$v_1^2+v_2^2=\frac{2 h}{m}\left(f_1+f_2\right)$
The capacitive reactance of a capacitor connected to 50 V d.c. is
zero.
$10 \Omega$.
$50 \Omega$.
infinity.
A particle performs S.H.M. with amplitude 'A'. The speed of the particle is $\left(\frac{1}{3}\right)^{\text {rd }}$ of the maximum speed when its displacement from the mean position is
$\frac{\mathrm{A}}{3}$
$\frac{\sqrt{2} \mathrm{~A}}{3}$
$\frac{2 \sqrt{2} \mathrm{~A}}{3}$
$\frac{2 \mathrm{~A}}{3}$
In the Bohr model of hydrogen atom, out of the following quantities, the principal quantum number is proportional to ( $\mathrm{R}, \mathrm{V}$ and E represent radius of the orbit, speed of electron and total energy of the electron respectively)
$\frac{\mathrm{V}}{\mathrm{R}}$
VR
$\frac{E}{V}$
$\frac{E}{R}$
MHT CET (Biology) Papers
All year-wise previous year question papers