Soaps clean surfaces on the principle of based on

Water is heated with a coil of resistance R connected to domestic supply. The rise of temperature of water will depend on

1. supply voltage

2. current passing through the coil

3. time for which voltage is supplied

Select the correct answer using the codes given below.

A pendulum clock is lifted to a height where the gravitational acceleration has a certain value of g. Another pendulum clock of same length, but of double the mass of the bob is lifted to another height where the gravitational acceleration is $${g \over 2}$$. The time period of the second pendulum would be (in terms of period T of the first pendulum)

The loudness of sound depends upon the