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2. Physics

A fire engine is approaching you with its siren on. As it passes you its pitch

  • increases.
  • stays the same.
  • decreases.

Explanation from PART66Online

This is the Doppler effect. While the siren approaches, the waves are compressed and the pitch is higher; the moment it passes and recedes the waves are stretched, so the perceived pitch drops. The frequency therefore decreases as the fire engine moves away from you.

W

WilliamTan asked · 15 Aug 2013

Please write your comment here.

Community Comments (1)

M
MridulDev 15 Aug 2013
Ur welcome :)
hyperphysics.phy-astr.gsu.edu/hbase/s...

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