A steel wire of mass 4 g and length 80 cm is fixed at the two ends. The tension in the wire is 50 N , then the frequency of fourth harmonic is
250 Hz
500 Hz
700 Hz
1000 Hz
Ratio of powers of a convex and concave lens is $\frac{3}{2}$ and their equivalent focal length (when lenses are kept in constant) is 30 cm . Focal lengths of lenses are
$75 \mathrm{~cm},-50 \mathrm{~cm}$
$10 \mathrm{~cm},-15 \mathrm{~cm}$
$15 \mathrm{~cm},-10 \mathrm{~cm}$
$50 \mathrm{~cm},-75 \mathrm{~cm}$
The radius of the orbit of an electron in a Hydrogen-like atom is $45 a_0$, where $a_0$ is the Bohr radius. Its orbital angular momentum is $\frac{3 h}{2 \pi}$. It is given that $h$ is Planck constant and $R$ is Rydberg constant. The possible wavelength(s), when the atom de-excites, is (are)
$\frac{9}{32 R}$
$\frac{9}{16 R}$
$\frac{9}{15 R}$
$\frac{4}{3 R}$
A ball suspended by a thread swings in a vertical plane, so that its acceleration in the extreme position and lowest position are equal. The angle $\theta$ of thread deflection in the extreme position will be
$\tan ^{-1}(2)$
$\tan ^{-1}(\sqrt{2})$
$\tan ^{-1}\left(\frac{1}{2}\right)$
$2 \tan ^{-1}\left(\frac{1}{2}\right)$
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