Light propagates 2 cm distance in glass of refractive index 1.5 in certain time. In the same time same light propogates a distance of 2.25 cm in a medium. The refractive index of the medium is
$\frac{4}{3}$
$\frac{3}{2}$
$\frac{8}{3}$
$\frac{3}{4}$
In photoelectric effect experiment, the stopping potential for a given metal is $\mathrm{V}_0$ (in volt) when radiation of wavelength $\lambda_0$ is used. If radiation of wavelength $5 \lambda_0$ is used with the same metal, then the stopping potential is (in volt) ( $\mathrm{h}=$ Planck's constant, $\mathrm{c}=$ velocity of light, $\mathrm{e}=$ electronic charge)
$\quad \mathrm{V}_0-\frac{4 \mathrm{hc}}{5 \mathrm{e} \lambda_0}$
$\quad \mathrm{V}_0+\frac{4 \mathrm{hc}}{5 \mathrm{e} \lambda_0}$
$\mathrm{V}_0+\frac{2 \mathrm{hc}}{3 \mathrm{e} \lambda_0}$
$\quad \mathrm{V}_0-\frac{2 \mathrm{hc}}{3 \mathrm{e} \lambda_0}$
A transverse wave is moving along a string. The linear density of a vibrating string is $2 \times 10^{-3} \mathrm{~kg} / \mathrm{m}$. The wave equation is $y=0.02 \sin (2 x+10 t) m$. The tension in the string is
$2 \times 10^{-2} \mathrm{~N}$
$5 \times 10^{-2} \mathrm{~N}$
$2 \times 10^{-3} \mathrm{~N}$
$5 \times 10^{-3} \mathrm{~N}$
Out of the following properties describing diamagnetism, identify the property which is "WRONG"
Diamagnetic materials possess no net magnetic dipole moment.
Diamagnetic materials are repelled by a magnet.
When placed in external magnetic field diamagnetic materials move from stronger to weaker part of magnetic field.
The magnetic susceptibility of diamagnetic materials is positive.
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