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

Subtopic:  Types of Waves |
 61%
From NCERT
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A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at a distance of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is :

(1) 9 : 4

(2) 2 : 3

(3) 3 : 2

(4) 4 : 9

Subtopic:  Energy of Waves |
 70%
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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

Subtopic:  Wave Motion |
 81%
From NCERT
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The equation of a wave is y=2sinπ(0.5x200t), 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

Subtopic:  Wave Motion |
 89%
From NCERT
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Equation of a progressive wave is given by

y=0.2cos0.04πt+0.02πxπ6

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

Subtopic:  Types of Waves |
 75%
From NCERT
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Two waves are given by y1=asin(ωtkx) and y2=acos(ωtkx). The phase difference between the two waves is :

(1) π4

(2) π

(3) π8

(4) π2

Subtopic:  Types of Waves |
 88%
From NCERT
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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

Subtopic:  Wave Motion |
 52%
From NCERT
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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

Subtopic:  Wave Motion |
 78%
From NCERT
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A plane wave is represented by x=1.2sin(314t+12.56y)

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

Subtopic:  Types of Waves |
 76%
From NCERT
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The equation of a wave traveling in a string can be written as y=3cosπ(100tx). Its wavelength is :

(1) 100 cm

(2) 2 cm

(3) 5 cm

(4) None of the above

Subtopic:  Travelling Wave on String |
 83%
From NCERT
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