Question

Which of the following is the unit of frequency?

• A. Hertz
• B. Second
• C. Decibel
• D. Metre

Answer 1

The correct option is A

Hertz

Explanation of correct option:

Option (A)

1. The number of vibrations produced in one second by a vibrating body is called its frequency.
2. It is denoted by the symbol f.
3. It is measured in Hertz (Hz).

Explanation of incorrect options:

Option (B)

1. The time taken by a vibrating body to complete its one vibration is called the time period.
2. It is denoted by T.
3. The unit of the time period is second(sec).

Option (C)

1. The characteristic of a sound that distinguishes a feeble sound from a loud sound of the same frequency is loudness.
2. The loudness of a sound is measured in decibel (dB).

Option (D)

1. The actual length covered by a body is called distance.
2. The standard measurement of distance is metres (m).

Thus, option (A) Hertz is the correct option.