Doppler Effect Quiz

How is the occurrence of the Doppler effect associated with sound waves?

• The doppler effect occurs because sound waves have a constant speed in a medium.

• The doppler effect occurs instead of sound waves in a medium.

In the Doppler effect, what happens to the wavelength, frequency and pitch when observer or object approaches?

• wavelength is shorter, while frequency and pitch are higher

• wavelength is longer, while frequency and pitch are lower

In the Doppler effect, what happens to the wavelength, frequency and pitch when observer or object moves away?

• wavelength is shorter, while frequency and pitch are higher

• wavelength is longer, while frequency and pitch are lower

Police radar guns, Doppler weather and light waves rely on the Doppler effect. What is the term used to describe a glowing object moving toward an observer?

• blueshift

• redshift

Police radar guns, Doppler weather and light waves rely on the Doppler effect. What is the term used to describe a glowing object moving away from an observer?

• blueshift

• redshift

Why are glowing objects and the observer moving closer together called blueshift?

• the observed frequency shifts toward that end of the spectrum with shorter wavelengths and higher frequencies when the object and observer approach each other.

• the observed frequency shifts toward that end of the spectrum with longer wavelengths and lower frequencies when they move away from each other.

Why are glowing objects and the observer moving farther apart called redshift?

• the observed frequency shifts toward that end of the spectrum with shorter wavelengths and higher frequencies when the object and observer approach each other.

• the observed frequency shifts toward that end of the spectrum with longer wavelengths and lower frequencies when they move away from each other.

Sound waves travel away from the source in how many dimensions?

• three dimensions

• five dimensions

What will happen if the source moves after emitting a sound?

• The source will move further from these wave fronts and never hear the sound.

• The source will approach the already moving wave fronts in one direction and move further from these wave fronts in the other direction.

A noisy car idles at rest. Sound waves as wavefronts travel away from the car in all directions, at a speed of about 770 mph. What happens to the wavefronts around the car?

• The wavefronts become more closely spaced in every direction.

• The wavefronts are evenly spaced around the car and moving away from the car in every direction.