Physics
Grade-8
Easy

Question

Pick the wrong statement about echo.

  1. Reflected sound is called echo.
  2. Roaring of thunder is an example of echo.
  3. Echo is produced when sound is incident on hard and polished surface.
  4. Echoes are resulted from a fixed number of reflecting surfaces.

hintHint:

Multiple echoes can be heard when a sound is reflected from various reflecting surfaces.

The correct answer is: Echoes are resulted from a fixed number of reflecting surfaces.


    • The reflected sound is called an echo.
    • Roaring of thunder is an example of echo.
    • Echo is heard when sound is incident on a hard and polished surface.
    • Multiple echoes may be heard one after the other when sound gets repeatedly reflected from various reflecting surfaces.
    • Therefore, statement given in option d is wrong.
    • So, the correct option is d.

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