P4 Unit 21 Pitch

P4 Unit 21 Pitch

What is pitch and how can we change the pitch of a sound?

Pitch

*Pitch of a sound refers to the sharpness of a sound

*High pitched sounds are produced when the object making the sound vibrates VERY FAST

*Low pitched sounds are produced when the object making the sound vibrates SLOWLY

Check this :

High and Low - Animal sounds - YouTube

Multiple Choice

Which of these option that has high pitched sound?

• dog's bark

• tiger's roar

• bird's shrieks

Multiple Choice

Which one from this option has low pitched sound?

• crown's shriek

• dog's bark

• bird's shriek

Changing the pitch of a sound

We can changes the pitch of the sound made by an object

For example :

Changing Pitch in Musical Instrument (Grade 4) ---- Science for You - YouTube

Multiple Choice

This is one way of how to change the increase pitch of the sound by the guitar ?

• Decrease the tightness of a string by adjusting a tuning peg

• Increase the tightness of a string by adjusting a tuning peg

Intensity

The intensity of a sound is how loud the sound is

A loud sound has a high intensity

A soft sound has a low intensity

Loud and Soft Sounds - YouTube

A loud with high intensity VS a sound with a high pitch

A loud with high intensity and a sound with a high pitch are different a sound with high pitch can have a low intensity

Example:

Bird chirping?

a bass drum ?

Multiple Choice

Are these same a sound with high intensity and a sound with high pitch?

• yes

• no

Changing the intensity of a sound

We can changes the intensity or loudness of a sound made by an object if we can change the force of the action that makes the object vibrate

Fill in the Blank

bird chirping has ......... pitch but bird chirping has ............intensity

Fill in the Blank

Bass drum has low pitch but bass drum has ..... intensity

Loud sounds

Danger of loud sounds

When we hear loud sounds it damages our hearing and can even cause deafness or loss of hearing

Noise pollution

Noise pollution is refers to sounds that are loud, unpleasant, and disruptive to human and animal life.

Fill in the Blank

When we hear loud sounds it .......... our hearing and can even cause deafness or loss of hearing

Multiple Choice

What is the example of 60-70 dB activity that we can hear?

• city traffic

• normal conversation

• subway train

• loud rock concert

Multiple Choice

When you hear Jet engine regulary in 140 dB, what will happen to your ear?

• loss of hearing

• pain in the ear begins

• permanent ear damage

Protecting Our ears

• 1. Rest your ears in a quite environment at night

• 2. Keep the volume in music players, stereos and television sets low

• 3. Wear protective ear plugs or earmuffs when working in places where the is constant exposure to loud sounds

• 4. Avoid to going to noisy places like theatres, amusement centers , and games arcades for long periods of times

Multiple Select

Which of the options are the correct way to protect our ears?

• rest your ears in a quite environment at night

• keep the volume loud on music player

• wear protective ear plugs or earmuffs when working in places where there is constant exposure to loud sounds

• go to noisy places regulary without ear protective