Quizziz HW 1-1 (Doppler Sound & Light)

Which wave in the diagram has the greatest frequency?

• 1

• 2

• 3

• 4

Answer explanation

Wave 4 has the greatest frequency because frequency is inversely related to wavelength. In the diagram, wave 4 has the shortest wavelength, indicating it oscillates the most times per second, thus having the highest frequency.

Tags

NGSS.HS-PS4-1

Which word is used to identify the distance between points C & G?

• Amplitude

• Crest

• Frequency

• Wavelength

Answer explanation

The distance between points C and G in a wave is referred to as the wavelength. Wavelength measures the length of one complete wave cycle, making it the correct term for this distance.

Tags

NGSS.HS-PS4-1

You can't hear sounds in outer space because there is no

• medium

• light

• energy

• heat

Answer explanation

You can't hear sounds in outer space because sound requires a medium (like air or water) to travel through. In the vacuum of space, there is no medium, so sound cannot propagate.

All waves carry ________ as they travel from one place to another.

• matter

• space

• energy

• water

Answer explanation

All waves, including sound and light, carry energy as they propagate through different mediums. Therefore, the correct answer is energy, as waves do not transport matter, space, or water.

Tags

NGSS.HS-PS3-2

NGSS.HS-PS4-5

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

Answer explanation

The Doppler Effect refers to the change in frequency of a wave as observed when the source of the wave and the observer are in relative motion. This is why the correct choice is about the change in frequency due to this motion.

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

When the car moves AWAY from you, its horn seems...

• Low pitched

• High pitched

• Normal

Answer explanation

When the car moves away from you, the sound waves are stretched, causing the horn to sound lower in pitch. This phenomenon is known as the Doppler effect, which explains why the correct answer is 'Low pitched'.

Tags

NGSS.HS-PS4-1

When an ambulance move TOWARD you it sounds ________ pitched. 

• high

• low

• medium

Answer explanation

When an ambulance moves toward you, the sound waves are compressed, resulting in a higher pitch due to the Doppler effect. Therefore, the correct answer is 'high' pitched.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

The Doppler Effect can be applied to both sound and light waves

• True

• False

Answer explanation

The Doppler Effect describes the change in frequency or wavelength of waves in relation to an observer moving relative to the source. It applies to both sound waves (e.g., a passing siren) and light waves (e.g., redshift in astronomy), making the statement true.

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

The observable evidence of light waves that are decreasing in frequency is a shift towards the ​ (a)   end of the visible light spectrum.

• red

• blue

Answer explanation

The observable evidence of light waves decreasing in frequency corresponds to a shift towards the red end of the visible light spectrum, known as redshift. This indicates lower energy and longer wavelengths.

Tags

NGSS.HS-ESS1-2

NGSS.HS-PS4-4

A 'redshift' in the light from very distant galaxies suggests that the galaxy is _____.

• fixed and stationary

• moving randomly

• moving towards the observer

• moving away from the observer

Answer explanation

A 'redshift' indicates that the light from a galaxy is stretched to longer wavelengths, which occurs when the galaxy is moving away from the observer. This is a key observation supporting the expansion of the universe.

Tags

NGSS.HS-ESS1-2