A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill?

PHCN measures its electrical energy in

Which gas produces a pink coloured light in a discharge tube?

A glass bottle of initial volume 2 x 104 cm3 is heated from 20oC to 50oC. If the linear expansivity of glass is 9 x 106K-1, the volume of the bottle at 50oC is

What is the best method of demagnetizing a steel bar magnet?

The magnitude of the angle of dip at the equator is

When \( {}^{210}_{82}\mathrm{Pb} \) decays to \( {}^{206}_{80}\mathrm{Pb} \), it emits

In a common emitter configuration, the output voltage is through the

What type of reaction is represented by the equation \( {}^{2}_{1}X + {}^{2}_{1}X \rightarrow {}^{3}_{2}Y + {}^{1}_{0}n + \text{Energy} \)