Which is an example of a longitudinal wave?

How does sound travel from its source to your ear?

Which form of energy is sound?

Astronauts in space need to communicate with each other by radio links because

The loudness of a sound is most closely related to its

For a normal person, audible frequency range for sound wave lies between

When the frequency of a sound wave is increased, which of the following will
decrease?
i. wavelength ii. period iii. amplitude