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Q1. The frequency of tuning forks A and B are respectively 3% more and 2% less than the frequency of tuning fork C. When A and B are simultaneously excited, 5 beats per second are produced. Then the frequency of the tuning fork 'A' in (in Hz) is
  •  98
  •  100
  •  105
  •  103
Solution



Q2.In a stationary wave all the particles
  •  On either side of a node vibrate in same phase
  •  In the region between two nodes vibrate in same phase9
  •  In the region between two antinodes vibrate in same phase
  •  Of the medium vibrate in same phase
Solution
In stationary wave all the particles in one particular segment (i.e., between two nodes) vibrates in the same phase

Q3.  A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance 1.21 Å between them. The wavelength of the standing wave is
  •   1.21Å
  •  1.42Å
  •  6.05Å
  •  3.63Å
Solution


Q4. A wave has velocity v in medium P and velocity 2v in medium 𝒬. If the wave is incident in medium P at an angle of 30°, then the angle of refraction will be
  •  45°
  •  30°
  •  60°
  •  90°
Solution



Q5.When both the listener and source are moving towards each other, then which of the following is true regarding frequency and wavelength of wave observed by the observer?
  •  More frequency, less wavelength
  •  More frequency, more wavelength
  •  less frequency, less wavelength
  •  More frequency, more wavelength
Solution
 



Q6. The fundamental frequency of a sonameter wire is v. if its radius is doubled and its tension becomes half, the material of the wire remains same, the new fundamental frequency will be
  •  V
  •  v/(2√2)
  • v/2
  •  v/√2
Solution


Q7.Beats are produced by two travelling waves each of loudness I and nearly equal frequencies n_1and n_2. The beat frequency will be …. and maximum loudness hard will be
  •  (n_1-n_2 ),2I
  •  (n_1-n_2 ),I
  •  (n_1-n_2 ),4I
  •  (n_1-n_2 ),3I
Solution
Beat frequency=number of beats s^(-1) =n_1-n_2 And maximum loudness =(a+a)^2=4a^2=4I_1 or 4I_2=4I

Q8.A pulse of a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected with
  •  The same phase as the incident pulse with no reversal of velocity
  •  A phase change of 180° with no reversal of velocity
  •  A phase change of 180° with velocity reversed
  •  The same phase as the incident pulse but with velocity reversed
Solution
A pulse of a wave train when travels along a stretched string and reaches the fixed end of the string, then it will be reflected back to the same medium and the reflected ray suffers a phase change of π with the incident wave but wave velocity after reflection does not change.

Q9.A progressive wave y=a sin [(kx-ωt)] is reflected by a rigid wall at x=0. Then the reflected wave can be represented by
  •  y=-a sin (kx-ωt)
  •  y=a sin (kx-ωt)
  •  y=a sin (kx+ωt)
  •  y=-a sin (kx+ωt)
Solution
Given, Progressive wave y=a sin (kx-ωt) When reflected by right wall Progressive wave y’= a sin [k(-x)-wt)] Or y’ = a sin [-(kx+ωt)] Or y’ = a sin (kx+ωt)

Q10. If the temperature is raised by 1 K from 300 K the percentage change in the speed of sound in the gaseous mixture is (R=8.31 J/mol-K)
  •  0.334%
  •  0.167%
  •  1%
  • 2%
Solution


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BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET, IIT JEE COACHING INSTITUTE: WAVE MOTION QUIZ-5
WAVE MOTION QUIZ-5
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