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 21082Pb 82 210 P b decays to 20680Pb 80 206 P b , it emits

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

What type of reaction is represented by the equation 21X+21X→32Y+10n+Energy