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प्रश्न
State the safe limit of sound level in terms of decibel for human hearing.
उत्तर
The safe limit of sound level for human hearing is 30 decibels (30 dB).
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संबंधित प्रश्न
How is loudness related to the amplitude of wave?
Standing at a distance, how is it possible to detect the filling of bucket under a water tap by hearing the sound?
Two identical guitars are played by two persons to give notes of the same loudness and pitch. Will they differ in quality? Give reason for your answer.
- 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)?
Two identical guitars are played by two persons to give notes of the same pitch. Will they differ in quality? Give a reason for your answer.
Explain the following and illustrate your answer by drawing appropriate diagram:
Pitch
Name the factors which determine the pitch of a 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.
Give scientific reasons.
In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.
