Sound Class 9 NCERT

Sound moves in a _________.

• Transverse wave
• Longitudinal wave

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

How is sound produced?

• By the vibration of particles
• By the transfer of particles 

Tags

NGSS.MS-PS4-1

Area of a longitudinal wave where particles are CLOSE together.

• Compression
• Rarefaction

Area of a longitudinal wave where particles are APART. 

• Compression
• Rarefaction

Which device measures sound waves?

• Oscilloscope
• Stethoscope 
• Radio
• I don't know

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

The reflection of sound waves off of a hard surface can create ______.

• A wave
• An echo 

Tags

NGSS.MS-PS4-2

Soft surfaces _______ sound waves. 

• Reflect
• Absorb

Tags

CCSS.RL.6.7

CCSS.RI.8.7

CCSS.RL.7.7

CCSS.RL.5.7

CCSS.RL.8.7

___________ measures  how close or  far particles are.

• Amplitude
• Frequency 

Tags

NGSS.MS-PS4-1

________ describes how LOUD a sound is. 

• Amplitude
• Frequency 

____________ is determined by sound wave's frequency. 

• Compression
• Pitch