14.2 Sound Intensity and Sound Level

What is the relationship between the intensity of a sound wave and its pressure amplitude?

• Intensity is directly proportional to the pressure amplitude.

• Intensity is inversely proportional to the pressure amplitude.

• Intensity is proportional to the square of the pressure amplitude.

• Intensity is independent of the pressure amplitude.

What units are used for pressure amplitude in the context of sound waves?

• Kilograms per cubic meter (kg/m³)

• Meters per second (m/s)

• Pascals (Pa) or Newtons per square meter (N/m²)

• Watts per square meter (W/m²)

What is the reference intensity (I₀) used in defining the sound intensity level?

What is the formula used to calculate sound intensity level in decibels?

What is the perception of frequency in sound called?

• Loudness

• Pitch

• Intensity

• Amplitude

Which part of the ear is responsible for converting sound waves into electrical nerve impulses?

• Outer ear

• Middle ear

• Inner ear

• Pinna

What is the range of frequencies that humans can normally hear?

• 20 to 20,000 Hz

• 45 to 110,000 Hz

• 10 to 15,000 Hz

• 30 to 25,000 Hz

What is the function of the middle ear in the hearing process?

• It carries sound to the eardrum

• It converts sound into mechanical vibrations

• It transforms sound into electrical signals

• It detects the direction of sound

How does the size of a musical instrument affect the pitch it produces?

• Larger instruments produce higher-pitch sounds.

• Smaller instruments produce lower-pitch sounds.

• Larger instruments produce lower-pitch sounds.

• The size of the instrument does not affect pitch.

What is the term used to describe the ability to identify musical notes by listening to them?

• Timbre

• Relative pitch

• Absolute pitch

• Frequency