Solution:
It takes 80 calories to melt 1 gram of ice. If 1 g of ice (at 0 degrees Celsius) is given 80 calories, it will melt and the final temperature of the water will be 0. Freezing water at 0 degrees Celsius: It also takes 80 calories to freeze 1 gram of water.

Solution:
Millikan determined the mass of the electron by measuring the charge of the electron.

Solution:
Polished surfaces are poor radiators of heat. So loss of heat on that account is reduced and the electric iron remains hotter than otherwise.

Solution:
Conversion of heat into electrical energy is achieved by using thermocouple.

Solution:
Velocitation is a phenomenon caused by driving for long periods at high speeds. A driver may experience velocitation when coming off of the highway; the change in speed makes him or her think that the car is going much slower than it actually is. Velocitation is the tendency to be traveling at a speed that is faster than perceived.

Solution:
In the gamma decay of a nucleus neither the mass number nor the atomic number of the nucleus changes.

Solution:
The device which converts sound energy into electrical energy is called microphone.