The series limit for the frequency of Balmer series is ' $\mathrm{v}_{\mathrm{B}}$ ', then the series limit frequency of Paschen series ' $v_p$ ' is
$\quad \frac{2}{9} \mathrm{v}_{\mathrm{B}}$
$\quad \frac{9}{4} \mathrm{v}_{\mathrm{B}}$
$\frac{4}{9} \mathrm{v}_{\mathrm{B}}$
$\frac{2}{3} \mathrm{~V}_{\mathrm{B}}$
In Young's double slit experiment, the intensities at two points, for the path difference $\frac{\lambda}{4}$ and $\frac{\lambda}{3}$ are $\mathrm{I}_1$ and $\mathrm{I}_2$ respectively. If $\mathrm{I}_0$ denotes the intensity produced by each one of the individual slits then the ratio $\left(\mathrm{I}_1+\mathrm{I}_2\right): \mathrm{I}_0$ is $\left(\cos 45^{\circ}=1 / \sqrt{2}\right)\left(\cos 60^{\circ}=0.5\right)$
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1
A system is compressed adiabatically, then its temperature
increases.
decreases.
becomes zero.
remains constant.
A solenoid has core of a material with relative permeability 301 and its winding carries a current of 2 A . The number of turns of the solenoid is 600 per metre. The magnetization of the material is
$3.6 \times 10^{-5} \mathrm{~A} / \mathrm{m}$
$3.6 \times 10^5 \mathrm{~A} / \mathrm{m}$
$1.8 \times 10^{-5} \mathrm{~A} / \mathrm{m}$
$1.8 \times 10^5 \mathrm{~A} / \mathrm{m}$
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