Physics
Grade-8
Easy
Question
An increase in wavelength makes a sound wave _______.
- Ultra
- Infra
- Audible
- None
Hint:
Frequency and wavelength are inversely proportional
The correct answer is: Infra
- Frequency and wavelength are inversely proportional to each other.
- Therefore, increase in wavelength means decrease in frequency .
- So, the correct option is b.
- Sounds with frequencies below 20Hz are infrasound.
- Wave speed= frequency × wavelength
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