Sound 2.0

Which diagram of a sound wave represents the sound with the highest pitch?

• A

• B

• C

• D

A sound with a frequency of 52 Hz has higher pitch than a sound with a frequency of 40 Hz.

• True

• False

Maria plays a note on a guitar. The note has a frequency of 256 Hz. How many times a second does the string vibrate.

• 128

• 256

• 512

• 1028

Alex heard a very loud noise. The sound has a high _____________.

• amplitude

• pitch

• length

• frequency

Jackson sees a lightning strikes and hears the thunder 5 seconds later. How far was the lightning? (In 1 second, sound travels 330 m in air.)

• 330 m

• 5 m

• 1650 m

• 66 m

Who shouts louder?

• A

• B

• The loudness is the same.

A medium can be a ___________________.

• solid

• liquid

• gas

• all of the above

Sound with frequencies between 20 Hz and 20 000 Hz are known as_______________.

• ultrasound

• infrasound

• audible range

Sound waves with frequencies above 20,000 Hz are called________.

• echolocation

• audible range

• infrasound

• ultrasound

You cannot hear ultrasound because it is_______________.

• too loud

• too quiet

• high frequency

• low frequency