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An efficient step-down transformer decreases

The final temperature of 1 liter of 40°C water poured into 1 liter of 20°C water is

Infrared waves are often called heat waves because they

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