The Science of Sound

What term describes the number of vibrations per second of a frequency?

• 20Hz to 20kHz

• Hertz (Hz)

• A woman's voice because it is higher.

• Ultrasound

What is the average range of frequencies the human ear can detect?

• 20Hz to 20kHz

• 60Hz to 60kHz

• 10Hz to 10kHz

• 30Hz to 30kHz

A man's voice has a certain frequency range. A woman's voice occupies another frequency range. Which voice vibrates at a faster rate?

• A mans voice because its lower

• A woman's voice because it is higher.

Name the term for extremely high frequencies.

• Infrasound

• Hertz (Hz)

• A woman's voice

• Ultrasound

What animal can detect the highest frequency sounds?

• Bats or Dolphins

• Bears or tigers

• Fish and seahorses

• Dog and cats

What practical purpose do ultrasonic waves serve?

• Elephants or alligators

• Infrasound

• Cleaning jewelry, detecting babies in the womb

• Detecting earthquakes. Whales and elephants also use them to communicate.

Name the term for extremely low frequencies.

• Elephants or alligators

• Infrasound

• Cleaning jewelry, detecting babies in the womb

• Detecting earthquakes. Whales and elephants also use them to communicate.

What animal can detect the lowest frequency sounds?

• Elephants or alligators

• Infrasound

• Cleaning jewelry, detecting babies in the womb

• Detecting earthquakes. Whales and elephants also use them to communicate.

What practical purpose do infrasonic waves serve?

• Elephants or alligators

• Infrasound

• Cleaning jewelry, detecting babies in the womb

• Detecting earthquakes. Whales and elephants also use them to communicate.

Music is based on blending different frequencies. If a tuning fork vibrates at 1000Hz, at what rate would another fork need to vibrate to sound an octave (eight notes) lower?

• 500Hz

• 100Hz

• 200Hz

• 10000Hz