Doppler Effect Calculations

An astronomer looks at a star in the night sky. Based on his calculations the star's light is shifting towards the color blue. What does this mean about the star?

• It's moving towards the astronomer

• It's moving away from the astronomer

• It's not moving at all

Tags

NGSS.HS-ESS1-2

When an ambulance move TOWARD you it sounds ________ pitched. 

• high

• low

• medium

Tags

NGSS.HS-PS4-1

When a car moves towards you, the sound of its horn seems relatively...

• Low pitched

• High pitched

• Normal

Tags

NGSS.HS-PS4-1

The top spectra is the laboratory spectra and is not moving. What type of shift is shown with the bottom spectra and is the object moving towards or away from the observer?

• Red Shift

  Towards

• Red Shift

  Away

• Blue Shift

  Towards

• Blue Shift

  Away

Tags

NGSS.HS-PS4-3

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

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

• A) 545 Hz

• B) 515 Hz

• C) 485 Hz

• D) 500 Hz

Tags

NGSS.HS-PS4-1

An ambulance is moving away from you with its siren on. If the original frequency of the siren is 700 Hz and you hear it at 650 Hz, what can you infer about the speed of the ambulance? (Assume the speed of sound is 340 m/s)

• A) 20 m/s

• B) 30 m/s

• C) 40 m/s

• D) 50 m/s

Tags

NGSS.HS-PS4-1

A star is moving away from Earth at a high speed. If the light from the star is observed to be redshifted, what does this indicate about the star's motion?

• A) The star is moving towards Earth

• B) The star is stationary

• C) The star is moving away from Earth

• D) The star is moving in a circular orbit around Earth

A car is approaching a stationary observer with a horn frequency of 400 Hz. If the observer hears a frequency of 420 Hz, what is the speed of the car? (Assume the speed of sound is 340 m/s)

• A) 10 m/s

• B) 15 m/s

• C) 20 m/s

• D) 25 m/s

Tags

NGSS.HS-PS4-1

If a sound source is moving at the speed of sound, what is the observed frequency by a stationary observer?

• A) Infinite

• B) Zero

• C) Same as the source frequency

• D) Double the source frequency

Tags

NGSS.HS-PS4-1