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Compared with the speed of light in a vacuum, the speed of light in the empty space between molecules in glass is

Voltage produced by a generator alternates because

Both heavy and light molecules make up a sample of gas. On average, the slower molecules are the

Electric charge distributes itself on conducting surfaces

Our ears are best at hearing

When the temperature of a fixed volume of air initially at 0° C is lowered by 1 degree, its pressure

Because of refraction a fish in the water appears

A device that transforms mechanical energy to electrical energy is a

If the same quantity of heat is added to both a 1-liter and a 2-liter container of water, the temperature change in the 1-liter container will be

The addition of salt to water affects its