7. Choose the correct answer I

Exercise condition:

3 m.

1. Which of the following vibrates when a musical note is produced by the cymbals in a orchestra?

90°air columns
stretched membranes
metal plates
stretched strings

2. Sound travels in air __________.

if there is no moisture in the atmosphere
if disturbance moves
if both particles as well as disturbance move from one place to another
if particles of medium travel from one place to another

3. A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through __________.

vacuum
wax
empty vessel
water

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