Question

1. ___________ force tends to bring bob to its mean position.

2. Hertz is the unit of ___________.

3. Device used for sound navigation and ranging is called ____________.

4. The product of wavelength and frequency is _____________ .

5. SONAR uses ______________waves in its operation.​

Answer 1

Answer:

2. frequency

3.sonar

Explanation:

Answer 2

Answer:

1) gravity or gravitational force

2) frequency

3) SONAR device or echosounder

4) velocity or speed

5)sound waves

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Explanation: