Wavelength

Q. The distance between a compression and the adjacent rarefaction is

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

Q. Define wavelength, frequency and time period.

Q. A bat can hear sound of frequencies upto 120 kHz. The minimum wavelength of sound which it can hear is : ( Take speed of sound in air as 344 $m{s}^{-1}$)

1. 2.87 mm
2. 3.87 mm
3. 4.87 mm
4. 5.87 mm

Q.

According to the equation, v = f λ, frequency and wavelength are inversely proportional to each other.

1. True

2. False

Q.

The velocity of sound in air is 330 m/s. Find the wavelength of sound waves if its frequency is 10 kilohertz.

Q.

The distance between a crest and the next trough in a transverse wave is (in terms of wavelength $\lambda$)

1. $\lambda$

2. $2\lambda$

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

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

Q. The distance between two consecutive crests and troughs of a wave is called ___________ and its SI unit is _________.

1. frequency, hertz (Hz)
2. wavelength, metre(m)
   
3. time period, second
   
4. amplitude, hertz (Hz)
   

Q.

Two sound waves, in air, have wavelengths in the ratio 1:3. Find the ratio of their frequencies.

Q.

What is the relation between wavelength and frequency?

1. λ=v/c

2. λ=c/v

3. λ=cv

4. λ=1/c

Q. What is the relationship between wavelength and frequency in a given medium?

1. Wavelength is directly proportional to frequency
2. Wavelength is inversely proportional to frequency
3. Frequency is twice the wavelength
4. Wavelength is twice the frequency

Q. What is the SI unit of wavelength?

Q.

The ratio of two frequencies of mechanical waves is 4:3 propagating in a medium. What will be:

The ratio of their time period?

Q. The wavelength of a sound wave is $40cm$ and the time period is $0.0005s$. How many seconds will it take to travel a distance of $4km$?

1. $5s$
2. $11s$
3. $7s$
4. $16s$

Q. Label the parts of the transverse wave given below.

1. Trough
2. Amplitude
3. Crest

Q.

Sound travels ______________ in steel than in water.

Q.

Most people can detect frequencies as high as $20000Hz$. Assuming the speed of sound in air to be $345m{s}^{-1}$, determine the wavelength of sound corresponding to this upper range of audible hearing.

Q.

The displacement-distance graph for a particle in a wave is shown below. Then ___ m is the wavelength$\left(\lambda \right)$ of the wave.

Q. Which of the following does the sound wave carry while propagating through a medium?

1. Molecules
2. Atoms
3. Energy
4. Electrons

Q.

Parul plays a note of a frequency 4 kHz on her synthesiser. She knows the speed of sound is 340 m/s in air. What is the wavelength of the required note?

1. 0.85 m

2. 0.085 cm

3. 0.085 m

4. 0.0085 m

Q. Find the wavelength of the given wave.

1. $2m$
2. $4m$
3. $6m$
4. $12cm$

Q.

The ratio of two wavelengths of sound in air is 3:4. Find the ratio of their frequencies.

Q.

The distance between a compression and the next rarefaction will be the $\frac{1}{3}rdofthewavelength.$

1. True

2. False

Q. Calculate the wavelength of a sound wave travelling in air with a frequency of 20 Hz.
Assume the speed of the sound wave in air is 330 m/s.

1. 15 m
2. 20 m
3. 16 m
4. 16.5 m

Q.

In which of the three media, air, water, or steel does sound travels the fastest?

Q. Two waves propagating in the same medium have wavelengths in the ratio of 1:4. What is the ratio of their frequencies?

1. 1:4
2. 4:1
3. 1:2
4. 2:1

Q. The SI unit of wavelength is

1. metre
2. hertz
3. second
4. centimetre

Q.

Higher amplitude carries more energy and gives more sound.

1. True
2. False

Q. 35. A light of wavelengthgets rotracted from vacuumto a medium of retractive index n. The, ratio ofwavelengths af incidant and refracted wave is(1) 1n(3) n:(4) 1

Q. In a ripple tank, $10$ full ripples/s are produced. The distance between peaks of consecutive trough and crest is $15cm$. Calculate the wavelength.

1. $0.15m$
2. $0.3m$
3. $0.45m$
4. $0.6m$

Q. The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

1. 6000