 # Physics Practical Class 11 To study the relation between the length of a given wire and tension for constant frequency using a sonometer. Viva Questions with Answers

1) If a particle is in simple harmonic motion, its acceleration is inversely proportional to its displacement from the mean position. Is it true or false?

The above statement is false because the acceleration of the particle moving with simple harmonic motion is directly proportional to the displacement of the particle from the mean position.

2) What should be the length of the string in order to double the period of a simple pendulum?

According to the formula of periodic time, tp = 2п√L/g

Hence, then the length should be quadrupled if the period is doubled.

3) What is Simple Harmonic Motion?

A repetitive back and forth movement of an object through an equilibrium position is known as simple harmonic motion. The movement should be such that the extreme displacement on one side of the centre position is equal to the extreme displacement on the other side.

To complete each vibration, the time interval will be the same.

4) What is a Sonometer?

A sonometer is a device that is used to demonstrate the relationship between the frequency of the sound that is produced by the string when it is plucked.

5) What is the Law of Length?

As long as the tension of the string and the mass per unit length are constant, the frequency of the vibration of a string is inversely proportional to the resonating length; this is the statement of the Law of Length.

F ∝ 1/l

6) What is the Law of Tension?

As long as the mass per unit length and the resonating length of the string is constant, the frequency of vibration of a string is directly proportional to the square root of its tension; this is the statement of the Law of Tension.

F ∝ √T

7) What is the Law of Mass?

As long as the tension and length are constant, the frequency of vibration of a string is inversely proportional to the square root of its mass per unit length; this is the statement of the Law of Mass.

F ∝ 1/√m

8) What are the uses of a sonometer?

As we know, to demonstrate the relationship between the frequency of the sound that is produced by the string when it is plucked, a device is used, which is called a sonometer.

Hence, the following can be determined using a sonometer:

• The frequency of the tuning fork
• The frequency of alternating current
• The tension in the string
• The unknown mass of a hanging object.

### 9) What do you mean by standing wave?

The combination of two waves obtained due to interference, having the same amplitude and frequency and moving in opposite directions is known as a standing wave. The standing wave is also identified as the stationary wave.

10) Which material is used for sonometer wire?

Soft iron is used to construct the wire in the sonometer.