Question

Choose the correct option to fill in the blank.

1. Any sound below ________ (20,000 Hz/20 H) cannot be heard by human ears

2. Echocardiograms use ______ (ultrasonic/infrasonic) waves to look into your body

3. Sound cannot travel through mediums where there are ________ (more/no) particles

4 Objects with lower pitch have _______(low/high) frequency

5 Loudness depends on _______(frequency/amplitude) .

6. Fluffy materials _______
(absorb/reflect) sound,

7. Echo can be heard only if the reflected sound reach our ears _______ (after/ before) 0.1 s of the original sound.​

Answer 1

Answer:

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Explanation:

1. 20 H

2. ultrasonic

3. no

4.low

5.amplitude

6.absorb

7.after

Answer 2

Explanation:

A1) 20hz

A2)Ultrasonic

A3) No

A4) Low

A5) Amplitude

A6) Absorb

A7)After

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