Review on Sound waves

Which of the following do sound waves travel fastest?

• Air

• Flood

• Table

Refers to highness and lowness of sound.

• Amplitude

• Loudness

• Pitch

Which of the following refers to how soft or how intense the sound is as perceived by the ear and interpreted by the brain?

• Amplitude

• Loudness

• Pitch

In which of the following material will sound waves travel slowest?

• Hydrogen (20C)

• Iron

• Seawater

in which level do sound considered as not safe for hearing?

• 30 dB

• 75 dB

• 90dB