Sound Wave

If the distance represented by the letter A were increased, how would it change the way the sound was heard?

• The sound would be higher. 

• The sound would be lower. 

• The sound would be softer. 

• The sound would be louder. 

Answer explanation

Increasing the distance represented by A means the sound waves have more space to travel, which typically results in a louder sound. Therefore, the correct answer is that the sound would be louder.

Tags

NGSS.MS-PS4-1

What does pitch depend on?

• amplitude 

• frequency

• intensity 

• volume of sound

Answer explanation

Pitch depends on frequency, which is the number of vibrations per second. Higher frequencies result in higher pitches, while lower frequencies produce lower pitches. Amplitude and intensity relate to loudness, not pitch.

When a sound is louder what measurement gets bigger?

• Frequency 

• Amplitude 

• Wavelength 

• Crest

Answer explanation

When a sound is louder, its amplitude increases. Amplitude measures the height of the sound wave, which directly correlates to the loudness we perceive. Therefore, a larger amplitude means a louder sound.

Tags

NGSS.MS-PS4-1

A wave that requires a medium through which to travel

• mechanical wave

• chemical wave

• electromagnetic wave

• pitch

Answer explanation

A mechanical wave requires a medium, such as air or water, to travel through. In contrast, electromagnetic waves can travel through a vacuum. Therefore, the correct answer is a mechanical wave.

Sound is produced by

• music

• vibrations of molecules

• Electromagnetic Waves 

• Transverse Waves 

Answer explanation

Sound is produced by vibrations of molecules in a medium, such as air or water. These vibrations create pressure waves that our ears perceive as sound, making 'vibrations of molecules' the correct answer.

Tags

NGSS.MS-PS4-1

Between waves F and G, which is lower in pitch?

• Wave F

• Wave G

Answer explanation

Wave F is lower in pitch than Wave G. Lower pitch corresponds to lower frequency, and since Wave F is identified as the lower pitch wave, it is the correct choice.

Tags

NGSS.HS-PS4-1

The number of wavelengths that pass a point each second

• frequency

• wavelength

• pitch

• amplitude

Answer explanation

The number of wavelengths that pass a point each second is defined as frequency. It measures how often a wave cycles in a given time, making frequency the correct choice over wavelength, pitch, or amplitude.

Tags

NGSS.HS-PS4-1

When the sound source moves, the frequency changes
ex. police car siren sounding lower pitch after the car passes

• pitch

• frequency

• Doppler Effect

• medium

Answer explanation

The change in frequency of the sound as the source moves, like a police siren, is explained by the Doppler Effect. It describes how the observed frequency varies due to the relative motion between the source and the observer.

Tags

NGSS.HS-PS4-1

What does pitch depend on?

• amplitude 

• frequency

• intensity 

• volume of sound

Answer explanation

Pitch depends on frequency, which is the number of vibrations per second. Higher frequencies result in higher pitches, while lower frequencies produce lower pitches. Amplitude and intensity relate to loudness, not pitch.

Sound Waves Move faster in what temperature 

• Heat 

• Cold

• Doesn't Matter

• Both

Answer explanation

Sound waves travel faster in heat because warmer temperatures increase the energy of the molecules in the medium, allowing sound to propagate more quickly. Therefore, the correct answer is Heat.

Tags

NGSS.MS-PS3-4