Contents

- Q1: Define amplitude.
- Q2: What is called time period?
- Q3: Define frequency.
- Q4: What are ultrasonic waves?
- Q5: The maximum displacement of an oscillating object is called the ……… .
- Q6:The number of oscillations per second made by the object is called the …….…. .
- Q7: What do you mean by the term loudness?
- Q8: Pendulum A makes 14 oscillations in five seconds and pendulum B makes 10 oscillations in three seconds. Which has a higher frequency? Express the frequency of each pendulum in hertz.
- Q9: Define Hertz.

## Q1: Define amplitude.

**Ans.** It is the maximum displacement of a vibrating body on one side.

## Q2: What is called time period?

**Ans.** It is the time taken by a vibrating body to complete one oscillation.

## Q3: Define frequency.

**Ans.** It is the number of vibrations produced by a vibrating body in one second.

## Q4: What are ultrasonic waves?

**Ans.** It is the sound of frequencies more than 20000 hertz. We cannot hear such sounds.

## Q5: The maximum displacement of an oscillating object is called the ……… .

**Ans.** Amplitude.

## Q6:The number of oscillations per second made by the object is called the …….…. .

**Ans.** Frequency.

## Q7: What do you mean by the term loudness?

**Ans.** The sound of high amplitude is called loudness.

## Q8: Pendulum A makes 14 oscillations in five seconds and pendulum B makes 10 oscillations in three seconds. Which has a higher frequency? Express the frequency of each pendulum in hertz.

**Ans.**

Frequency of A = \(\frac{14}{5}\) = 2.8 hertz

Frequency of B = \(\frac{10}{3}\) = 3.33 hertz

Therefore, Pendulum B has higher frequency.

## Q9: Define Hertz.

**Ans.** Frequency of a vibration or oscillation is measured in hertz. It is the unit of frequency.

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