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Sound Test - 36

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Sound Test - 36
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The relation between frequency(f) and time period(T) is given by
    Solution
    The frequency (f) of a wave is the number of full wave forms generated per second. This is the same as the number of repetitions per second or the number of oscillations per second.  
    Time Period (T) is the number of seconds per waveform, or the number of seconds per oscillation.  It is clear that frequency and time period are reciprocals. 
    That is,     T=1/f.  
  • Question 2
    1 / -0
    The distance between two consecutive compressions (C) or two consecutive rarefactions (R) is called the
    Solution
    Wavelength is the distance between consecutive corresponding points of the same phase, such as crests, troughs, compressions, rarefactions or zero crossings and is a characteristic of both travelling waves and standing waves, as well as other spatial wave patterns. 
    Hence, The distance between two consecutive compressions (C) or two consecutive rarefactions (R) is called the wavelength.
  • Question 3
    1 / -0
    If any explosion takes place at the bottom of a lake, what type of shock waves in water will take place?
    Solution
    If any explosion takes place at the bottom of a lake, Longitudinal waves are formed in the water.
    Longitudinal waves are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of travel of the wave. Mechanical longitudinal waves are also called compression waves, because they produce compression and rarefaction when traveling through a medium. In longitudinal waves, the displacement of the medium is parallel to the propagation of the wave. Below is the diagrammatic representation.

  • Question 4
    1 / -0
    Longitudinal waves are also called
    Solution
    Sound is a mechanical wave that results from the back and forth vibration of the particles of the medium through which the sound wave is moving. If a sound wave is moving from left to right through the air, then particles of air will be displaced both rightward and leftward as the energy of the sound wave passes through it. The motion of the particles is parallel to the direction of the energy transport. This is what characterizes sound waves in the air as longitudinal waves.
    Longitudinal waves are also called compressional waves or rarefactional waves because they produce compression and rarefaction of the pressure when traveling through a medium.
  • Question 5
    1 / -0
    The type of waves produced by bats are
    Solution
    Bats send out sound waves using their mouth or nose.  When the sound hits an object an echo comes back. The bat can identify an object by the sound of the echo. They can even tell the size, shape and texture of a tiny insect from its echo. Most bats use echolocation to navigate in the dark and find food. 
    The sound waves produced by the bats are ultrasonic waves. Bats emit sounds at typically 2 or 3 times higher pitch than we can hear. Sounds above human hearing are usually called ultrasonic.
  • Question 6
    1 / -0
    For hearing the loudest ticking sound heard by the ear, the angle x in the given figure is:

  • Question 7
    1 / -0
    What is necessary for the production and transmission of sound?
    Solution
    The vibrations that create sound must travel through a medium, such as air or water, or anything made of molecules. 
  • Question 8
    1 / -0
    No sound is possible in a .......... .
    Solution
    Sound is a mechanical wave which propagate in medium like solid, liquid and gas. In vacuum, there is no medium is present  hence no sound is possible in a vacuum.
  • Question 9
    1 / -0
    Sound waves requires a .......... to travel through.
    Solution
    Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.
  • Question 10
    1 / -0
    A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m :
    Solution
    The speed of the sound, distance traveled and the time taken relationship if the sound is a reflected sound, that is echo, it is given as follows.
    $$Speed\quad of\quad sound=\dfrac { 2\times Distance\quad traveled\quad (m) }{ Time\quad taken\quad (s) } $$.
    In the question it is given that distance traveled by the sound from the object to the submarine is 3625 meters and the time taken to hear the echo is 5 seconds.
    The speed of the sound wave is calculated as follows.$$v=\dfrac { 2\times 3625\quad m }{ 5\quad s } $$.
    Hence, the speed of the sound is 1450 m/s.
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