Physics
Grade-8
Easy

Question

An increase in wavelength makes a sound wave _______.

  1. Ultra
  2. Infra
  3. Audible
  4. None 

hintHint:

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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