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

Which form of energy is sound?

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

How does sound travel from its source to your ear?

Which is an example of a longitudinal wave?

The loudness of a sound is most closely related to its

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