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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An observer standing near the seashore observes 54 waves per minute. If the wavelength of the water wave is 10m then the velocity of a water wave is :

(1) 540 ms-1

(2) 5.4 ms-1

(3) 0.184 ms-1

(4) 9 ms-1

Concept Questions :-

Wave motion
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The equation of a wave is $y=2\mathrm{sin}\pi \left(0.5x-200t\right)$, where x and y are expressed in cm and t in sec. The wave velocity is :

(1) 100 cm/sec

(2) 200 cm/sec

(3) 300 cm/sec

(4) 400 cm/sec

Concept Questions :-

Wave motion
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Equation of a progressive wave is given by

$y=0.2\mathrm{cos}\pi \left(0.04t+.02x-\frac{\pi }{6}\right)$

The distance is expressed in cm and time in second. What will be the minimum distance between two particles having the phase difference of π/2 :

(1) 4 cm

(2) 8 cm

(3) 25 cm

(4) 12.5 cm

Concept Questions :-

Types of waves
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Two waves are given by ${y}_{1}=a\mathrm{sin}\left(\omega t-kx\right)$ and ${y}_{2}=a\mathrm{cos}\left(\omega \text{\hspace{0.17em}}t-kx\right)$. The phase difference between the two waves is :

(1) $\frac{\pi }{4}$

(2) π

(3) $\frac{\pi }{8}$

(4) $\frac{\pi }{2}$

Concept Questions :-

Types of waves
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If the amplitude of waves at distance r from a point source is A, the amplitude at a distance 2r will be :

(1) 2A

(2) A

(3) A/2

(4) A/4

Concept Questions :-

Wave motion
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A wave is reflected from a rigid support. The change in phase on reflection will be :

(1) π/4

(2) π/2

(3) π

(4) 2π

Concept Questions :-

Wave motion
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A plane wave is represented by $x=1.2\mathrm{sin}\left(314\text{\hspace{0.17em}}t+12.56y\right)$

Where x and y are distances measured along in x and y direction in meters and t is time in seconds. This wave has

(1) A wavelength of 0.25 m and travels in + ve x-direction

(2) A wavelength of 0.25 m and travels in + ve y-direction

(3) A wavelength of 0.5 m and travels in – ve y-direction

(4) A wavelength of 0.5 m and travels in – ve x-direction

Concept Questions :-

Types of waves
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