Question

A. Fill in the blanks.

1.Birds have a ring of cartilage, called ________ in their wind pipes.
2.The SI unit of 'loudness' of sound, is___________ .
3. The pitch of a sound is determined by its ___________ .
4. Sounds, of frequency more than 20 kHz, are known as __________.
5.An irregular, irritating sound is referred to as a __________.
​

Answer 1

1. Syrinxs

2. decibles

3. flatness or shrillness

4. ultrasonic or ultrasound

5. noise

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Answer 2

Answer:

I hope this answers help you

Explanation:

1. syrinxs

2. decibles

3. flatness or shrillness

4. ultrasonic or ultrasound

5. noise