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Reflection of sound can occur in

Which one of the following does the speed of sound in air not depend on?

For a vibrating body, the number of vibrations per unit time is the

Both a transverse wave and a longitudinal wave have

The work you do when pushing a shopping cart twice as far while applying the same force is

All waves have in common a

The highness or lowness of a tone that is related to wave frequency is

Which requires more work:  lifting a 50 kg sack a vertical distance of 2 m or lifting a 25 kg sack a vertical distance of 4m?

The distance traveled by a wave during a single period is

When the wavefronts of sound travel at different speeds, the sound wave experiences