MCQ
The angular speed of seconds needle in a mechanical watch is
- ✓$\frac{\pi }{{30}}\,rad/s$
- B$2\pi \,rad/s$
- C$\pi \,rad/s$
- D$\frac{{60}}{\pi }\,rad/s$
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(Useful information) : $\sqrt{167 R T}=640 j^{1 / 2} mole ^{-1 / 2} ; \sqrt{140 RT }=590 j ^{1 / 2} mole ^{-1 / 2}$. The molar masses $M$ in grams are given in the options. Take the value of $\sqrt{\frac{10}{ M }}$ for each gas as given there.)
