Question

Which of the following is an example of the Doppler effect? (2 points)
A Ocean waves from two different directions that have canceled each other out
B Scientists show that different colored lights have different wavelengths
C The movement of objects due to unbalanced forces
D A train blows its horn as it travels towards you, and you perceive the pitch of the horn to increase

Answer 1

D. A train blows its horn as it travels towards you, and you perceive the pitch of the horn to increase

Explanation:

Doppler effect simply refers to the change in the frequency of a wave as the wave and observer moves close or away from each other.

This was proposed by Austrian Physicist Christian Doppler. This effect is noticed in light waves, sound waves and other forms of waves.

• As the wave source moves closer to the observer, the pitch of the wave in sound waves increases.
• When the source moves away, the sound begins to faint.
• This is the Doppler effect.

Learn more:

A bit on pitch https://brainly.com/question/233247

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Answer 2

Answer:

A train blows its horn as it travels towards you, and you perceive the pitch of the horn to increase

Explanation:

An example of the Doppler effect is when a police car moves past a person who is standing still.

As the police car moves towards them, the pitch of the police car's siren goes up because the sound waves get closer together in front of the police car.Thats the same as a train .

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