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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
Match the following
| column A | column B |
| (A) Amplitude | (1) frequency |
| (B) Frequency | (2) amplitude |
| (C) Loudness | (3)maximum displacement on either side |
| (D) Pitch | (4) presence of other frequencies |
| (E) Waveform | (5) 1/ time period |
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- loudness,
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