Sound

• physics, science
• Secondary Education

SCIENCE 

GRADE-9

NOV 5, 2020

Ms. Famin

IDENTIFY THE COMPONENTS OF WAVE = IN CHAT BOX 

OBJECTIVES 

Relate sound and loudness

Application of sound waves

compare

compare 

interpret 

Why is shout louder than a whisper?

reason - amplitude

A shout carries more energy than a whisper and hence sounds louder

Amplitude of a wave depends on the amount of energy the wave carries.

More the amplitude more the energy 

the Decibel scale 

loudness of sound is measured using decibel scale 

1. Which wave has the higher amplitude (a or b)? __

2. Which wave is from the loudest sound? ___

Which wave has vibrations that are closest together?

1. both
2. f
3. e
4. none

Which wave is from the highest pitch sound?

1. f
2. e
3. both
4. none

Analyze 

did anybody experience echo where, how, when ?

ECHO 

An echo is a reflected sound wave 

application of sound waves - SONAR

ECHOLOCATION 

ULTRASOUND 

MENTION ANY TWO USES OF SOUND WAVES