Sound Waves

True or False: Sound needs a medium.

• True

• False

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

A disturbance that travels through a medium as a longitudinal wave

• Pitch

• Wavelength

• Sound

• Frequency

Tags

NGSS.MS-PS4-1

True or False: Sound waves are faster than light.

• True

• False

The number of wavelengths that pass a fixed point each second is known as _________

• Frequency

• Hertz

• Amplitude

• Wave

Tags

NGSS.HS-PS4-1

The unit for measuring frequency is the __________

• Joule

• Gram

• Hertz

• Newton

Tags

NGSS.HS-PS4-1

Which of the following describes the doppler effect

• The change in frequency or wavelength of a wave due to the relative motion of the source and the observer.
• The absorption of light by a moving object.
• The reflection of sound waves off a surface.
• The increase in speed of a wave due to the observer's motion.

Tags

NGSS.HS-PS4-1

when a noise is moving towards an observer, the closer it comes...

• the lower the pitch

• the longer the noise

• the higher the pitch

• the quieter the noise

Tags

NGSS.HS-PS4-1

when a noise if moving away from an observer...

• the pitch is lower

• the pitch is higher

• the noise is smoother

• the energy is lower

Tags

NGSS.HS-PS4-1

An observer passes a 500 Hz sound source and moves away with a speed of 30 m/s. What is the frequency that the observer hears?

• 486 Hz

• 620 Hz

• 546 Hz

• 520 Hz

Tags

NGSS.HS-PS4-1

An ambulance is travelling towards a hospital at a constant velocity of 30 m/s. The siren of the ambulance produces sound of frequency 400 Hz. Take the speed of sound in air as 340 m/s.

Calculate the frequency of the sound of the siren heard by a person standing at the hospital.

• 438.7 Hz

• 484.4 Hz

• 400.2 Hz

• 361.9 Hz

Tags

NGSS.HS-PS4-1