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Form 2 Physics waves I topical questions and answers
State one difference between mechanical and electromagnetic waves.
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1.
(a) What is the difference between longitudinal and transverse waves?
2.
Calculate the wavelength of the KCB FM radio wave transmitted at a frequency of 95.6 Mega Hertz.
3.
(a) Give one example of a transverse wave and one example of longitudinal wave. (b) Fig 6 shows the displacement of a particle in a progressive wave incident on a boundary between deep and shallow regions. (i) Complete the diagram to show what is observed after boundary (Assume no loss of energy) (ii) Explain the observation in (i) above (c) Water waves are observed as they pass a fixed point at
4.
Figure 2 represents a displacement-time graph for a wave. (i) Determine the frequency of the wave. (ii) Sketch on the same axes, the displacement- time graph of a wave of the same frequency but #180^0# out of phase and with a smaller amplitude.
5.
The audible frequency range for a certain person is 30Hz and 16500 Hz. Determine the largest wavelength of sound in air the person can detect. (speed of sound in air=330m/s)
6.
Figure 3 shows a transverse wave travelling along x-axis. (i) Determine (I) Wavelength of the wave (II) Amplitude of the wave (ii) If the time taken by the wave to move from O to A is 0.09seconds, determine the: (I) Frequency of the wave (II) Speed of the wave
7.
State one difference between mechanical and electromagnetic waves.
8.
Figure 5 shows the displacement time graph of a wave travelling at 200cm/s. Determine for the wave, the (i) Amplitude (ii) Period (iii) Frequency (iv) Wavelength
9.
Figure 10 represents a transverse wave of frequency 5 Hz travelling in the x direction. Determine the speed of the wave.
10.
Figure 15 shows an arrow which indicates the direction of travel of a wave in a medium. In the space provided sketch diagram to show how the particle p moves when the wave is (i) A transverse wave (ii) A longitudinal
11.
A long coil is attached to a vibrating blade as shown in figure 3 State the type of mechanical wave generated by the set up and mark alongside the coil , the length corresponding to the wavelength, of the wave.
12.
Figure 4 shows the displacement – time graph for a certain wave. Determine the frequency of the wave.
13.
Figure 4 shows a hack- saw blade clamped horizontally on a bench and the free end is made to vibrate about the rest position. The movement 0?a?0?b?0?a?0?b, takes 0.7 seconds. Determine the frequency of the vibration of the blade.
14.
Figure 2 shows how the displacement varies with time for a certain wave. Determine the frequency of the wave.
15.
Figure 5, shows how the displacement of a point varies with time as a wave passes it. On the same diagram, draw a wave which passes with half the amplitude and twice the frequency of the one shown.
16.
The wavelength of a radio wave is 1km. Determine its frequency. (Take the speed of light as #3.0times 10^8 ms^-1#)
17.
Figure 6 shows standing waves on a string. It is drawn to scale of 1:5 (a) Indicate on the diagram the wavelength of the standing wave. (b) Determine the wavelength of the wave.
18.
Figure 12 shows a displacement –time graph for a progressive wave. (a) State the amplitude of the wave. (b) Determine the frequency of the wave (c) Give that the velocity of the wave is #20ms^-#1, determine its wavelength.
19.
A ship in an ocean sends out an ultra sound whose echo is received after 3 seconds . If the wavelength of the ultra sound in water is 7.5cm and the frequency of the transmitter is 20kHz, determine the depth of the ocean.
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