A source of the sound of frequency 600 Hz is placed inside water. The speed of sound in water is 1500 m/s and in the air is 300 m/s. The frequency of sound recorded by an observer who is standing in the air is : 

(1) 200 Hz

(2) 3000 Hz

(3) 120 Hz

(4) 600 Hz

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An underwater sonar source operating at a frequency of 60 kHz directs its beam towards the surface. If the velocity of sound in air is 330 m/s, the wavelength and frequency of waves in air are: 

(1) 5.5 mm, 60 kHz

(2) 330 m, 60 kHz

(3) 5.5 mm, 20 kHz

(4) 5.5 mm, 80 kHz

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It is possible to distinguish between the transverse and longitudinal waves by studying the property of :

(1) Interference

(2) Diffraction

(3) Reflection

(4) Polarisation

Concept Questions :-

Types of waves
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Water waves are 

(1) Longitudinal

(2) Transverse

(3) Both longitudinal and transverse

(4) Neither longitudinal nor transverse

Concept Questions :-

Types of waves
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The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as 

(1) Transverse wave

(2) Longitudinal waves

(3) Propagated waves

(4) None of these

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What is the phase difference between two successive crests in the wave?

(1) π

(2) π/2

(3) 2π

(4) 4π

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A wave of the frequency of 500 Hz has a velocity of 360 m/sec. The distance between two nearest points 60° out of phase, is :

(1) 0.6 cm

(2) 12 cm

(3) 60 cm

(4) 120 cm

Concept Questions :-

Types of waves
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Sound waves of wavelength greater than that of audible sound are called :

(1) Seismic waves

(2) Sonic waves

(3) Ultrasonic waves

(4) Infrasonic waves

Concept Questions :-

Types of waves
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The ratio of masses of nitrogen and oxygen is 14:16. The temperature at which the speed of sound in nitrogen will be same at that in oxygen at 55°C is -

(1) 35°C

(2) 48°C

(3) 65°C

(4) 14°C

Concept Questions :-

Energy of waves
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A wavelength 0.60 cm is produced in air and it travels at a speed of 300 ms–1. It will be an 

(1) Audible wave

(2) Infrasonic wave

(3) Ultrasonic wave

(4) None of the above

Concept Questions :-

Types of waves
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