Class Notes Topic 8 Lesson 3c

LOUDNESS AND PITCH
Factors Affecting Loudness

Amount of ENERGY = LOUDNESS

○The harder you knock the louder the sound !!!

Intensity = the amount of energy in a wave carries per second

Multiple Choice

What is the relationship between loudness and amplitude in a given sound?

• Loudness is directly related to the amplitude of a sound wave.
• Loudness is inversely related to the amplitude of a sound wave.
• Loudness has no correlation with the amplitude of a sound wave.
• Loudness is only related to the frequency of a sound wave.

Multiple Choice

Which best defines intensity of sound?

• Speed of sound in the medium
• Frequency of the sound waves
• Distance traveled by the sound waves
• Amount of energy transmitted per unit time through a unit area

LOUDNESS AND PITCH
Measuring Loudness

●Decibel (dB) - higher dB the higher the sound seems to the listener

Multiple Choice

What unit is used to measure sound loudness?

• Decibels (dB)
• Meters
• Watts
• Hertz

Multiple Choice

What is considered the pains threshold with regard to sound?

• 160-170 decibels
• 90-100 decibels
• 130-140 decibels

• 120-130 decibels

LOUDNESS AND PITCH

Factors Affecting Pitch

●Pitch - how high the sound sounds

○Higher the pitch → Higher the Frequency (Hz)

Multiple Choice

When the pitch goes up, what happens to the frequency?

• Frequency decreases
• Frequency remains constant
• Frequency increases
• Frequency becomes negative

DOPPLER EFFECT
-- The apparent change in pitch as a sound travels toward or away from
the observer.

Multiple Choice

What seems to change when a car drives by at high speed?

• Shape of the car
• Size of the car
• Color of the car
• Pitch of the sound

Multiple Choice

The Doppler effect is defined as what?

• The Doppler effect is the change in temperature of a wave in relation to an observer.
• The Doppler effect is the change in speed of a wave in relation to an observer.
• The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.
• The Doppler effect is the change in amplitude of a wave in relation to an observer.