The Big Bang Theory Wiki
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The “Doppler Effect” was first identified by Austrian physicist Christian Doppler in 1842. The phenomenon is the change in frequency of a moving object by a stationary observer, such as the change in pitch of a train horn or car siren as it gets closer and recedes from to someone standing at rest. As the object approaches the observer, the wavelength increases causing a rise in pitch and the opposite occurs as the object passes and travels away from the observer. The same effect is also used by astronomers when observing the “red shift” of galaxies in space to determine their velocity.

In “The Middle-Earth Paradigm”, Sheldon dresses up as the Doppler Effect and demonstrates it by saying “eeeeerrrrrr” and changing his pitch. No one besides his friend gets the connection and one person thinks he is a zebra.

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