Question

hiii please help
class-8
subject- science
chapter name - sound

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Answer 1

Answer:

1. 165to255hzz

2. ultrasound

3. A repetition of sound produced by the reflection of sound waves

4. light

Answer 2

Answer:

a) Woman are more high pitched than men because their vocal cards are THIN.

b) Sounds of frequency above 20,000Hz at called NOISE.

c) The VIBRATION of vocal cords help us to speak.

d) Echoes are the sound which repeat whatever is being spoken.

e) LIGHT travels faster than sound.