Page 133 - Primary Six Notes

Effects of temperature and wind on sound

1. Sound is heard more clearly during day, waves move close to

the ground at higher temperatures.

2. When it is hot , sound waves rise higher above the ground.

3. At night temperatures are lower (it is cool)

4. Wind carry sound further if it is blowing the same direction;

but if it is blowing against the sound it obstructs

Pitch

This is the highness or lowness of sound. / is the sharpness or

mildness of sound.

Pitch of sound can also be caused due to the amplitude pro-

duced.

The faster the body vibrates, the higher the frequency and

sound produced.

Factors that affect pitch of sound.

The following are the conditions that may make produced

sound heard with a low or high pitch.

i. Frequency.

ii. Tension of the string.

iii.Surface area for vibration.

iv. Length of the string.

Frequency

This is the number of vibrations per second. / number of os-

cillations made by a particle per second.