SOW Practical Notes

What equipment is used to test the class hearing range starting at 20 Hz moving to 20,000 Hz?

• Oscilloscope and speaker (or iPad app)

• Thermometer and barometer

• Voltmeter and ammeter

• Microscope and slides

What is the starting frequency for the class hearing range test?

• 20 Hz

• 200 Hz

• 2,000 Hz

• 10 Hz

Noises above what level may cause hearing damage to humans?

• 30 decibels

• 60 decibels

• 85 decibels

• 100 decibels

The range of human hearing is _______ Hz to _______ Hz.

• 20 Hz to 20,000 Hz

• 2 Hz to 2,000 Hz

• 200 Hz to 2,000 Hz

• 200 Hz to 20,000 Hz

Sounds below 20 Hz are called _______.

• infrasound

• ultrasound

• audible sound

• supersonic

Sounds above 20,000 Hz are called _______.

• ultrasound

• infrasound

• audible sound

• radio waves

In microphones, sound waves make a thin sheet of material called a _______ vibrate.

• diaphragm

• membrane

• coil

• circuit

What do electrical circuits in a microphone detect and convert to electrical current?

• They detect vibrations and convert them to electrical current.

• They detect light and convert it to electrical current.

• They detect heat and convert it to electrical current.

• They detect magnetic fields and convert them to electrical current.

Just like with ears, microphones change how energy is being transferred from _______ to _______.

• Sound to Electricity

• Light to Sound

• Heat to Motion

• Electricity to Magnetism

What is the role of the diaphragm in a microphone?

• The diaphragm vibrates when sound waves hit it, which helps convert sound energy into electrical energy.

• The diaphragm amplifies the electrical signal before it leaves the microphone.

• The diaphragm stores sound waves for later playback.

• The diaphragm filters out background noise before recording.