MCQ
Doppler's effect holds good for:
- AOnly sound waves.
- BOnly electromagnetic waves.
- CBoth sound waves and electromagnetic waves.
- DNone of the above.
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(Take $R$ = $8.3\ J/mol-K$ and $ln\ 2$ = $0.69$)

$(A)$ $|\vec{\tau}|=\frac{1}{3} \mathrm{Nm}$
$(B)$ The torque $\vec{\tau}$ is in the direction of the unit vector $+\hat{\mathrm{k}}$
$(C)$ The velocity of the body at $\mathrm{t}=1$ is $\overrightarrow{\mathrm{v}}=\frac{1}{2}(\hat{\mathrm{i}}+2 \hat{\mathrm{j}}) \mathrm{m} \mathrm{s}^{-1}$
$(D)$ The magnitude of displacement of the body at $\mathrm{t}=1 \mathrm{~s}$ is $\frac{1}{6} \mathrm{~m}$