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State one important property of waves used for echo depth sounding.
A tuning fork produces sound of ................... frequency.
If the amplitude of a wave is doubled, what will be the effect on its loudness?
Draw a diagram to show the wave pattern of high pitch note and a low pitch note, but of the same loudness.
Give scientific reason for the following:
When a nail is hammering appears to get higher and higher in pitch.
Give scientific reason for the following:
Windows sometimes rattle when the low notes of a pipe organ are sounded.
Two musical notes of the same pitch and loudness are played on a violin and a piano. Their waveforms are as shown in the figure below:
The diagram below shows three ways in which the string of an instrument can vibrate.
(i) Which of the above diagrams shows the fundamental note?
(ii) Which has the frequency 4 times that of the fundamental?
(iii) State the ratio between the frequency of the first and second.
If ______ of sound is decreased, its loudness also decreases.
