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प्रश्न
Name two sources of sound.
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उत्तर
Each vibrating body is a source of sound. We, the human beings, produce sound when our vocal cords vibrate on blowing air through them by our lungs. Some animals like birds, frogs etc., also produce sound due to vibration of their vocal cords. But bees do not have the voice-boxes. They produce sound by moving their wings up and down very fast.
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संबंधित प्रश्न
A tuning fork has a number 256 marked on it. What does this number signify?
Which object is vibrating when the following sounds are produced?
(i) The sound of a sitar
(ii) The sound of a tabla
(iii) The sound of a tuning fork
(iv) The buzzing of a bee or mosquito
(v) The sound of a flute
Fill in the blank with suitable word.
When the frequency of the sound is increased, the wavelength ____________.
A device called oscillator is used to send waves along a stretched string. The string is 20 cm long, and four complete waves fit along its length when the oscillator vibrates 30 times per second. For the waves on the strings.
(a) what is their wavelength?
(b) what is their frequency
(c) what is their speed?
Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?
When the pitch of note produced by a harmonium is lowered, then the wavelength of the note :
The region in a sound wave, with higher pressure and density, is called ______ and that with low pressure and density is called ______.
Match the following:
| Human larynx | Vibrations of metal arms |
| Loudspeaker | Vibrations in air column |
| Jal-Tarang | Vibrations in vocal cords |
| Tuning fork | Vibrations in strings |
| Sitar | Vibrations of screen |
What is vibration?
Sound travels in the air if
