Time Period

Q.

A source of sound produces 20 compressions and 20 rarefactions in 0.2 seconds. The distance between a compression and consecutive rarefaction is 50 cm. Find speed of wave?

Q.

The number of crests passing a given point in one second is (where T is time period and $v$ is frequency)

1. T

2. $v$

3. 2T

4. $2v$

Q.

If the amplitude (is assumed small) of a pendulum is doubled, its time period.

1. Does not change

2. Is doubled

3. is halved

4. increases four times.

Q.

The time taken by a sound wave having a frequency of 4 kHz and wavelength of 40 cm to travel 4 km is ___ .

Q.

Calculate the time period of tuning fork having frequency 25 Hz.

1. 40 s

2. 4000 s

3. 400 s

4. 4 s

Q.

What is the natural frequency of vibration of a simple pendulum of time period 2s?

Q.

Time period of a vibration is the reciprocal of its

1. Frequency

2. Wavelength

3. Amplitude

Q. Question 4
An object is vibrating at 50 Hertz. What is its time period?

(a) 0.02 s
(b) 2 s
(c) 0.2 s
(d) 20.0 s

Q. A guitar string makes $900$ oscillations in two seconds. Find its time period.

1. 0.0011
2. 0.0044
3. 0.0088
4. 0.0022

Q.

Calculate the frequency in hertz, for the following cyclical events.

(a) 120 oscillations in 2.0 s

Q.

The time period $\left(T\right)$ of a vibrating body of frequency $(f=100Hz)$ is:

1. 100 s

2. 10 s

3. 0.1 s

4. 0.01 s

Q. For a wave, which of the following products is equal to unity?

1. Frequency $\times$ Amplitude
2. Frequency $\times$ Time period
3. Amplitude $\times$ Time period
4. Frequency $\times$ Wavelength

Q. The frequency of a vibrating body is 5 Hz. Calculate its time period?

1. $0.1s$
2. $0.2s$
3. $0.4s$
4. $0.8s$

Q.

In which of the following cases time period of a wave is maximum?

1. When the frequency is f

2. When the frequency is f/4

3. When the frequency is f/2

4. When the frequency is 2f

Q.

Number of oscillations made by a wave in a unit time _______.

Q.

Calculate the frequency in hertz, for the following cyclic event.

45 revolutions of a turntable in one minute.

Q.

If a sound wave takes 8.4 s to complete 4 cycles, then its time period is?

1. 2.1 s

2. 21 s

3. 0.21 s

4. 1.2 s

Q. The frequency of a vibrating body is $25Hz$. Calculate its time period (in $sec$).

1. 0.04

Q.

The time taken by a sound wave having a frequency of 4 kHz and wavelength of 40 cm to travel 4 km is ___ .

Q.

The time taken by two consecutive compressions or rarefactions to cross a fixed point is called__

Q.

Calculate the frequency, in hertz, for the following cyclical events.

Ten swings of a pendulum in 6.7 s.

Q.

The time taken by two consecutive compressions or rarefactions to cross a fixed point is called the _____.

1. frequency

2. amplitude

3. wavelength

4. time period

Q. The time taken by two consecutive compressions or rarefactions to cross a fixed point is called the _____

1. wavelength
2. amplitude
3. frequency
4. time period

Q.

A sound wave has a frequency of 1000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?

1. 6.20 s

2. 2.94 s

3. 5.94 s

4. 7.10 s

Q.

What do you understand by oscillatory motion?

Q. 7The time periods of three sound waves A, B and Care 0.2 ms, 0.2 s and 3 s respectively. The inaudibleSound waves are 1) A and B(2) B and C3) A and C(4) A, B andC10

Q. A sound wave consists of :
(a) A number of compression pulses one after the other
(b) A number of rarefaction pulses one after the other
(c) Compression and rarefaction pulses one after the other.
(d) A compression and rarefaction pulse separated by a distance equal to one wavelength.