9th Class Science Sound Question Bank

done Sound IIT JEE Subjective Problems Total Questions - 28

• question_answer1)
  The diagram below shows a section of a wave form in a string. The numbers in the diagram show distances in centimeter. The speed of travel of the wave is\[\text{8}00\text{ m}{{\text{s}}^{-\text{1}}}\]. (i) What is the wavelength? (ii) What is the amplitude? (iii) Calculate the frequency?
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• question_answer2)
  Find the velocity of the wave shown in the figure below:
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• question_answer3)
  The following graphs show the displacement verses distance of a pulse on a rope at two different times. Find the speed of the pulse.
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• question_answer4)
  A boat at anchor is rocked by waves whose crests are 50m apart. If the crests are moving at\[\text{2}0\text{m}{{\text{s}}^{-\text{1}}}\], how often do they reach the boat?
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• question_answer5)
  An electromagnetic wave has a frequency of 500 MHz and a wavelength 60 cm. Name the medium through which it is travelling.
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• question_answer6)
  If wavelength of a sound wave in a medium is reduced by 50%, then what is the percentage change in its frequency?
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• question_answer7)
  A tuning fork produces waves of wave length 60 cm in a medium P. Calculate the wave length of the wave produced by it in a medium Q, given that velocity of waves in the medium P is\[\text{3}00\text{ m}{{\text{s}}^{-\text{1}}}\]and in the medium Q is\[\text{48}0\text{ m}{{\text{s}}^{-\text{1}}}\].
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• question_answer8)
  Wave length of yellow light is\[\text{589}\,{{A}^{0}}\]. If speed of light in air is\[\text{3}\times \text{1}{{0}^{\text{8}}}\text{ m}{{\text{s}}^{-\text{1}}}.\]What is the frequency of vibrations?
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• question_answer9)
  An observer, situated between two parallel cliffs, emits an intense sound note. Two successive echoes are then heard after 5s and 7s. Calculate the distance between the cliffs. (Velocity of sound\[=\text{34}0\text{ m}{{\text{s}}^{-\text{1}}}\])
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• question_answer10)
  A given sound wave, having a time period of\[{{10}^{-3}}s\], has a wavelength of 0.332m. If another sound wave has a lower time period of\[{{10}^{-4}}s\], find the frequency and wavelength of this new wave.
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• question_answer11)
  A stone is dropped into a well 44.1 m deep. The sound of the splash is heard 3.13s after the stone is dropped. Find the velocity of sound in air (\[\text{g}=\text{9}.\text{8m}{{\text{s}}^{-\text{2}}}\])
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• question_answer12)
  A T.V station transmits waves of frequency 200 MHz. Calculate the wavelength of the waves, if their speed in air is\[\text{3}.0\times \text{1}{{0}^{\text{8}}}\text{ m}{{\text{s}}^{-\text{1}}}\].
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• question_answer13)
  A longitudinal wave of wavelength 1 cm travels in air with a speed of \[\text{3}00\text{ m}{{\text{s}}^{-\text{1}}}.\]Can this wave be heard by a normal human being?
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• question_answer14)
  A tuning fork of frequency 500 Hz is employed to produce transverse waves in a long rope. The distance between two nearest crests is found to be 10cm. What is the velocity of the wave?
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• question_answer15)
  If the frequency of radio waves is 600 KHz, calculate the wave length of the radio waves. (Velocity of light\[~=\text{3}\times \text{1}{{0}^{\text{8}}}\text{ }{{\text{s}}^{-\text{1}}}\]).
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• question_answer16)
  A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 MHz. The speed of the sound in the tissue is\[\text{1}.\text{7}\,\text{km}{{\text{s}}^{-\text{1}}}.\]The wavelength of sound in the tissue is closed to (a) \[4\times {{10}^{-4}}m\]                        (b) \[8\times {{10}^{-4}}m\] (c) \[4\times {{10}^{-3}}m\]                        (d) \[8\times {{10}^{-3}}m\]
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• question_answer17)
  The minimum audible wavelength at room temperature in air is about (a) \[0.2\,\,\overset{{}^\circ }{\mathop{\text{A}}}\,\]                                    (b) \[5\,\,\overset{{}^\circ }{\mathop{\text{A}}}\,\] (c) 5 cm to 200 cm            (d) 20 mm
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• question_answer18)
  What is the maximum time taken by the particle in a ultrasonic wave to go from one extreme to another during its oscillations?
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• question_answer19)
  A body is vibrating 6000 times in one minute. If the velocity of sound in air is 360 m/s. Find (i) Frequency of vibration in hertz (ii) Wave length of wave produced
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• question_answer20)
  The wave length of sound emitted by a source is\[1.7\times {{10}^{-2}}m\]. Calculate the frequency of the sound if its velocity is\[\text{343}.\text{4 m}{{\text{s}}^{-\text{1}}}\].
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• question_answer21)
  Waves of frequency 100 Hz are produced in a string as shown in figure. Find the velocity of the wave?
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• question_answer22)
  Sound waves travel with a speed of about 330 m/s. What is the wave length of sound whose frequency is 550 Hertz?
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• question_answer23)
  If the period of small ripples on water is 0.1 ms and their wave length is 5cm. What is the speed of the waves?
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• question_answer24)
  A vibrating body is producing 30 waves in 6 seconds. The distance between a crest and next trough is 20 cm. Calculate the velocity of the waves.
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• question_answer25)
  Ultrasonic waves of frequency of 25 KHz travel in a liquid. If the wavelength of waves produced in the liquid is 50 mm. What is the speed of waves in the liquid?
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• question_answer26)
  A boy strikes the iron pipe with a stone. Another boy who keeps his ear close to the other end of the pipe heard two sounds in a short interval of time. Explain why?
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• question_answer27)
  Radio waves of speed\[\text{3}\times \text{1}{{0}^{\text{8}}}\text{ m}/\text{s}\] are reflected at the moon and received back on earth. The time elapsed between the sending of the signal and receiving it back at the earth station is 2.5s. What is the distance of the moon from the earth?
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• question_answer28)
  An observer stands at a distance of 850m from a cliff and fires a gun. After what time gap will he hear the echo, if sound travels at a speed at\[~\text{35}0\text{ m}{{\text{s}}^{-\text{1}}}\] in air?
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