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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
Name the physical qantity whose SI unit is 'hertz'.
What is the name of the strings which vibrate in our voice box when we talk?
A tuning fork has a number 256 marked on it. What does this number signify?
Name four ways in which sound can be produced.
Give reason for the following :
In most of the cases, we cannot see the vibrations of a sound producing object with our eyes.
How does sound from a sound producing body travel through air to reach our ears? Illustrate your answer with the help of a labelled diagram.
Fill in the blank with suitable word.
When the frequency of the sound is increased, the wavelength ____________.
The region in a sound wave, with higher pressure and density, is called ______ and that with low pressure and density is called ______.
Medium is ______ for generation of sound.
The vibrations of a simple pendulum are also known as _______.
