A standing wave is represented by

Y=Asin(100t)cos(0.01x)

where Y and A are in millimetre, t is in seconds and x is in metre. The velocity of the wave is :

(1) 104 m/s

(2) 1 m/s

(3) 10–4 m/s

(4) Not derivable from the above data

Subtopic:  Standing Waves |
 84%
From NCERT
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Two waves are approaching each other with a velocity of 20 m/s and frequency n. The distance between two consecutive nodes is :

(1) 20n

(2) 10n

(3) 5n

(4) n10

Subtopic:  Standing Waves |
 77%
From NCERT
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The following equations represent progressive transverse waves Z1=Acos(ωtkx), Z2=Acos(ωt+kx), Z3=Acos(ωt+ky) and Z4=Acos(2ωt2ky). A stationary wave will be formed by superposing :

(1) Z1 and Z2

(2) Z1 and Z4

(3) Z2 and Z3

(4) Z3 and Z4

Subtopic:  Standing Waves |
 82%
From NCERT
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Two traveling waves y1=Asin[k(xct)] and y2=Asin[k(x+ct)] are superimposed on the string. The distance between adjacent nodes is :

(1) ct / π

(2) ct / 2π

(3) π / 2k

(4) π / k

Subtopic:  Standing Waves |
 75%
From NCERT
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A string fixed at both ends is vibrating in two segments. The wavelength of the corresponding wave is :

(1) l4

(2) l2

(3) l

(4) 2l

Subtopic:  Travelling Wave on String |
 64%
From NCERT
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A 1 cm long string vibrates with the fundamental frequency of 256 Hz. If the length is reduced to 14cm  keeping the tension unaltered, the new fundamental frequency will be :

(1) 64

(2) 256

(3) 512

(4) 1024

Subtopic:  Travelling Wave on String |
 70%
From NCERT
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Standing waves are produced in a 10 m long stretched string. If the string vibrates in 5 segments and the wave velocity is 20 m/s, the frequency is :

(1) 2 Hz

(2) 4 Hz

(3) 5 Hz

(4) 10 Hz

Subtopic:  Standing Waves |
 70%
From NCERT
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A string is producing transverse vibration whose equation is y=0.021sin(x+30t), Where x and y are in meters and t is in seconds. If the linear density of the string is 1.3×10–4 kg/m, then the tension in the string in N will be :

(1) 10

(2) 0.5

(3) 1

(4) 0.117

Subtopic:  Travelling Wave on String |
 80%
From NCERT
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A stretched string of length l, fixed at both ends can sustain stationary waves of wavelength λ, given by 

(1) λ=n22l

(2) λ=l22n

(3) λ=2ln

(4) λ=2ln

Subtopic:  Standing Waves |
 69%
From NCERT
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A string on a musical instrument is 50 cm long and its fundamental frequency is 270 Hz. If the desired frequency of 1000 Hz is to be produced, the required length of the string is :

(1) 13.5 cm

(2) 2.7 cm

(3) 5.4 cm

(4) 10.3 cm

Subtopic:  Travelling Wave on String |
 83%
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