Doppler Problems

In this clip, the sound of the jet illustrates the doppler effect AS OBSERVED BY

• The man on the ground

• The pilot in the jet

• Both the man on the ground and the pilot in the jet

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NGSS.HS-PS4-1

From the perspective of the camera's position, the ambulance's siren sound should

• rise in pitch.

• fall in pitch.

• stay the same pitch.

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NGSS.HS-PS4-1

What is the Doppler Effect?

• A change in frequency due to the relative motion of a wave source and an observer

• When a wave overlaps with another wave

• When a wave bounces off of another object

• When a wave bends due to traveling through a different medium

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NGSS.HS-PS4-1

The Doppler effect applies to light waves as well as sound waves. Astronomers use this to measure the motion of stars and galaxies. In 1929, Edwin Hubble discovered that light from distant galaxies was shifted away from the blue end of the spectrum and towards the red end of the spectrum. Red light has a longer wavelength (and a lower frequency) than blue light. What could Hubble conclude about these galaxies?

• The distant galaxies are growing smaller.

• The distant galaxies are moving towards the Earth.

• The distant galaxies are moving away from earth

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NGSS.HS-ESS1-2

Assuming the speed of sound is 340 m/s, what is the most likely speed of the jet shown below?

• 200 m/s

• 500 m/s

• 100 m/s

• 340 m/s

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NGSS.HS-PS4-1

NGSS.HS-PS4-5

How do you calculate the magnitude of the doppler shift?

• Divide frequency in front of sound source by frequency behind the source

• Multiply the wavelength of the wave in front of the source by the velocity of sound

• Multiply velocity of sound by the velocity of source

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NGSS.HS-PS4-1

What direction is this object moving?

• left

• right

• up

• down

As objects move in space, their wavelengths change. This phenomenon is called the...

• Coriolis Effect

• Doppler Effect

• Movement Effect

• Black Hole Effect

Tags

NGSS.HS-PS4-1

Look at the picture. Who is experiencing a higher pitched sound?

• Observer A

• Observer B

• There's no difference

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NGSS.HS-PS4-1

A train is moving towards a stationary observer at a speed of 30 m/s. The train's horn emits a sound at a frequency of 500 Hz. What frequency does the observer hear? (Assume the speed of sound in air is 340 m/s)

• A) 545 Hz

• B) 500 Hz

• C) 455 Hz

• D) 600 Hz

Tags

NGSS.HS-PS4-1