Sound

Front

Vibration

Back

A back-and-forth movement

sự rung động

Front

Sound

Back

A form of energy made by vibrations

âm thanh

Front

Frequency

Back

Number of vibrations per second

tần số

Front

Medium

Back

Material sound travels through

môi trường truyền

Front

Ultrasound

Back

Sound above human hearing

siêu âm

Front

Vacuum

Back

Space with no particles

chân không

Front

Pitch

Back

How high or low a sound is

độ cao (âm)

Front

Amplitude

Back

Height of a wave from the middle

biên độ

Front

Sound wave

Back

A wave that carries sound energy

sóng âm

Front

Echo

Back

Reflected sound heard again

tiếng vang