Wavelength

Q.

How are wavelength and frequency related to speed of

soundwaves

Q. A tuning fork vibrates with a frequency of 256hz if the speed of sound is 345.6m/s find the wave length during the time the fork makes 60 vibrations

Q. The distance between a crest and an adjacent trough is

1. $\lambda$
2. $\frac{\lambda }{2}$
3. $2\lambda$
4. $\frac{3\lambda }{2}$

Q.

Question 10
The given graph shows the displacement versus time relation for a disturbance travelling with velocity of $1500m{s}^{-1}$ . Calculate the wavelength of the disturbance

Q.

Calculate the time taken by the sound wave to travel 1.5 km when the frequency and wavelength are 2000 Hz and 0.35 m respectively.

Q. We see the lightning flash before we can hear thunder because ___.

1. light travels faster than sound
2. sound travels faster than light
3. the sound of lightning is generated only after the lightning flashes
4. sound wave is a transverse wave

Q. The wave length of wave is1500m and it's frequency is 200khz . calculate the speed of this wave.

Q. A sound wave has a wavelength of 3 m. The distance from a compression centre to the adjacent rarefaction centre is?

1. 0.75 m
2. 1.5 m
3. 3.0 m
4. 6.0 m

Q.

Draw the sketches of two waves A and B such that wave A has twice the wavelength and half the amplitude of wave B.

Q. A sound wave has frequency of 2 kHz and wavelength 30 cm. It will travel a distance of 1.8 km in

1. 0.3 s
2. 3 s
3. 0.03 s
4. 12 s

Q.

Name the waves that are produced in the string of a guitar.

Q.

A wave is moving in air with a velocity of 340 m/s. Calculate the wavelength if its frequency is 512 vibrations / sec.

Q.

The wavelength of the sound produced by a tuning fork of frequency 450 Hz which is set to vibrate in air (take velocity of sound in air as 320 m/s) is

1. 144 cm

2. 7.1 cm

3. 0.711 m

4. 0.07 m

Q. What are the amplitude and wavelength of the wave shown in the figure given below?

1. $1cm,\frac{160}{9}cm$
2. $0.5cm,\frac{140}{9}cm$
3. $05cm,\frac{160}{9}cm$
4. $1cm,\frac{140}{9}cm$

Q.

What do you understand by loudness of sound?

Q.

Since sound waves can travel through air, and air can transmit only transverse waves, it follows that sound travels as transverse
waves.

1. True
2. False

Q.

The wavelength of sound is $1.7\times {10}^{-2}m$ .Calculate the frequency of sound.(velocity of sound is $v=343.3$ m/s)

Q. The displacement-time graph of a sound wave is given below. If the speed of the sound wave is $300m{s}^{–1}$ in a given medium, then the wavelength of the sound wave is

1. $\frac{1}{2}m$
2. $2m$
3. $3m$
4. $\frac{2}{3}m$

Q.

The number of waves contained in a unit length of a medium is called

1. elastic

2. wave number

3. wave pulse

4. electromagnetic wave

Q. A series of ocean waves, each 5.0 m from crest to crest, move past the observer at a rate of 2 waves per second. The velocity of the ocean wave is

1. 2.5 m/s
2. 5.0 m/s
3. 8.0 m/s
4. 10.0 m/s

Q. If the wind blows in the direction of sound then the Speed of sound becomes:
(v = final speed of sound; Vs = speed of sound; Vw = speed of wind)

1. $v=Vs–Vw$
2. $v=2Vs–Vw$
3. $v=Vs+Vw$
4. $v=Vs–2Vw$

Q.

Calculate the wavelength of a sound wave whose frequency is $220\mathrm{Hz}$ and speed is $440\mathrm{m}/\mathrm{s}$ in a given medium.

Q.

If the speed of a wave is 340 m/s and its frequency is 1700 Hz, then $\lambda$ for this wave in cm will be :

(a) 2

(b) 0.2

(c) 20

(d) 200

Q. A sound wave of wavelength 0.332 m has a time period of 1/1000 s. If the time period is decreased to 1/10000 s, calculate the wavelength

Q.

The musical notes produced by an instrument are of frequencies $256Hz$ and $384Hz$ respectively. Compare their wavelengths. Given that speed of sound in air is $344m/s$.

Q. For the given wave, $\frac{\lambda }{2}$ is represented by

1. CD
2. AD
3. BD
4. AE

Q.

The longitudinal waves travel in a coiled spring at a rate of 4 m/s. The distance between two consecutive compressions is 20 cm. Find :

(i) Wavelength of the wave

(ii) Frequency of the wave

Q.

The time period of a wave is $5\times {10}^{-3}$second and the wavelength is 50 cm. Calculate the frequency and speed of the wave.

Q. How many vibration will a running fork of frequency 280hz will complete during the time sound travel formed in air by 20m. Take speed of sound in air as 340m/s

Q.

The S.I. unit of wavelength is ___.

1. decibel

2. second

3. metre

4. metre per second