Hearing sound — task. Science CBSE Homework Assignments, Class 9.

1. Which is not the condition for hearing sound?

There must be a vibrating body capable of transferring energy.
There must be a material medium to pick up and propagate energy.
The medium must have a large density.
There must be receiver to receive the energy and interpret it.

2. An instrument commonly used in laboratory to produce a sound of some particular frequency is:

sonar
electric bell
tuning fork
a stretched wire

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