Question

true or false

1). 1 Hz means one vibration per second.
2). A short flute will produce sound of lower
pitch than a long flute.
3). Human speech is possible due to the
passage of air through the oesophagus.
4). The absorption and slow release of sound
waves by surfaces causes echoes.
5) Sound of frequency above 20,000 Hz is
called ultrasonic sound.
6). Excessive noise can cause deafness.
7). Curtains, cushions and rugs in a room
absorb sound.​

Answer 1

Answer:

1 true

2 false

3 false

4 false

5 true

6 true