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Fundamentals of Physics Exam 4 | Questions and Answers
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Fundamentals of Physics Exam 4 | Questions and Answers Sonar is a technology used to make maps of the sea floor, as well as to find fish and military targets. Sonar is very similar to medical ultrasound, in that it makes images using sound, but the sonar device is attached to the bottom of a boa...

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  • November 11, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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Fundamentals of Physics Exam 4



Sonar is a technology used to make maps of the sea floor, as well as to find fish and
military targets. Sonar is very similar to medical ultrasound, in that it makes images
using sound, but the sonar device is attached to the bottom of a boat and projects
downward through the water. While medical ultrasound uses frequencies in the MHz,
sonar works best with lower frequencies, because it has to travel longer distances.
Calculate the wavelength of a sonar wave with a frequency of 100 kHz. The speed of
sound in water is 1500 m/s.
15 mm

All electromagnetic radiation has a speed of c = 3 x 108 m/s.
What is the frequency of a green laser having a wavelength of 500 nm? (Answer in
THz)
600 THz

If a car that is moving away from you blows its horn, the frequency you hear will be
________ what the driver hears.

a. higher than
b. lower than
c. the same as
d. the inverse of

A sound wave has a speed of 340 m/s and a frequency of 1000 Hz. The period of the
sound is closest to ________ms.
1 ms

Regular water waves that we see on the beach are an example of ________ waves.

a. longitudinal
b. standing
c. doppler shifted
d. transverse

The speed of sound in water is _________ than in air.
Faster

The energy in a sound wave is mostly closely related to the ________ of the sound.

a. frequency
b. wavelength

, c. wave speed
d. amplitude

As humans age, they naturally lose sensitivity to ________ sounds.

a. longer wavelength
b. lower frequency
c. higher frequency
d. higher amplitude

The normally quoted frequency range of healthy human hearing is ________.

a. 20 Hz - 20 kHz
b. 20 Hz - 200 KHz
c. 20 Hz - 2kHz
d. 20 Hz - 2000 Hz

85 decibels= begin hearing damage

Dolphins and other marine mammals use ________ to communicate and navigate.
ultrasound
- sound composed of frequencies above the range of human hearing

The parameter of a sound wave that is perceived as pitch is the ________.

a. frequency
b. wave speed
c. wave shape
d. amp

The parameter of a sound wave that is heard as loudness is the ________.

a. wave shape
b. wavelength
c. frequency
d. intensity

The parameter of a sound wave that lets you identify voices and musical instruments is
the ________.

a. amplitude
b. frequency
c. wave shape
d. wavelength

Compared to a 90 dB sound, the intensity of a 40 dB sound is ________.

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