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प्रश्न
State one important property of waves used for echo depth sounding.
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उत्तर
The waves used for echo depth sounding are ultrasonic waves (frequency above 20000 Hz). The important property of such type of a wave is that they travel undeviated through long distances and that they can be confined to a narrow beam. They are not easily absorbed in a medium.
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संबंधित प्रश्न
Name the factor that determines Loudness of the sound heard.
Smaller the membrane, .................. is the pitch.
Name and define the characteristic which enables one to distinguish two sounds of same loudness, but of different frequencies, given by the same instrument.
- Which of the following quality determines the loudness of a sound wave?
- wavelength
- frequency and
- amplitude
- How is loudness related to the quantity mentioned above in part (a)?
How does the wave pattern of a loud note differ from a soft note? Draw a diagram.
Draw a diagram to show the wave pattern of high pitch note and a low pitch note, but of the same loudness.
It is observed that during march-past we hear a base drum distinctly from a distance compared to the side drums.
(i) Name the characteristics of sound associated with the above obervation.
(ii) Give a reason for the above observation.
Explain the following and illustrate your answer by drawing appropriate diagram:
Quality of a musical note.
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.
