Question

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Answer 1

Answer:

1. the frequency 2. thermal 3.zero 4. virtual 5.longitudinal

Answer 2

Answer:

1. The pitch of a sound depends on its frequency

2. During digestion of food the chemical energy of food changes into thermal energy

3. No work is done when displacement takes place at right angles to the direction of applied force.

4. For a plane mirror the image is always virtual image

5. Sound wave propagates in air as a longitudinal wave