Sound Test - 5

In a transverse wave, the medium has particles that vibrate in a direction perpendicular to the direction of the propagation of wave. Here the formation of crest and trough takes place. The polarization of transverse wave is possible.  The upward movement from mean position is called crest and downward movement is called trough.

X-rays are a form of electromagnetic radiation, as are radio waves, infrared radiation, visible light, ultraviolet radiation and microwaves.These waves do not require material medium for its propagation.

The wave formed because of the oscillation; parallel to the disturbance; is called longitudinal wave. Sound is a longitudinal wave as the wave particles of sound travel parallel to the direction of motion by forming compression and rarefaction.

The maximum displacement of the particles of a mediumfrom their mean position during the propagation of a wave is called the amplitude of the wave. Loudness of sound depends upon amplitude.

Loudness of sound depends upon amplitude,more the amplitude of a wave, more is the loudness produced.Amplitude is the maximum displacement of a particle from its mean position.

One crest and a trough make a single wavelength.

Therefore,according to the question,20 wavelenghts are made.

Therefore, time = 0.2 sec

Time period=0.2/20 = 0.01 second.

Frequency = 1/time period = 1/0.01 = 100 Hz.

Wave motion shifts wave energy from one region to another region. Mass is not transferred during wave motion.

v= 440 ms^-1 ; frequency = 840 Hz

Wavelength= wave speed / frequency = 440/840 = 0.53 m.

Distance between two consecutive crests is called wavelength.

Therefore, wavelength= 100 m.

Here,wave velocity = 20 ms^-1 

 frequency = wave velocity/ wavelength.

=> frequency= 20/100 = 0.2 Hz.

The speed of a sound wave depends on the properties of the medium through which it moves and the only way to change the speed is to change the properties of the medium. So, given statement is incorrect statement.