Answer these questions to make sure you understand the concepts covered in this lesson.
What happens to a wave's frequency if the wavelength of the sound is increased by a factor of 2? (Assume the speed remains constant).
- it doubles
- it's cut in half
- it quadruples
- it's cut in a fourth
For speed to stay the same, the product of wavelength and frequency must remain constant. If you increase one, the other must decrease by the same factor.
For speed to stay the same, the product of wavelength and frequency must remain constant. If you increase one, the other must decrease by the same factor.
For speed to stay the same, the product of wavelength and frequency must remain constant. If you increase one, the other must decrease by the same factor.
For speed to stay the same, the product of wavelength and frequency must remain constant. If you increase one, the other must decrease by the same factor.
Which of the following would not be audible by the human ear?
- infrasonic wave
- ultrasonic wave
- both of these
- neither of these
Infrasonic waves are below the range of human hearing. Ultrasonic waves are above the range of human hearing.
Infrasonic waves are below the range of human hearing. Ultrasonic waves are above the range of human hearing.
Infrasonic waves are below the range of human hearing. Ultrasonic waves are above the range of human hearing.
Infrasonic waves are below the range of human hearing. Ultrasonic waves are above the range of human hearing.
One sound has a decibel level of 70 dB and another has a decibel level of 50 dB. How does the second sound compare to the first in terms of relative intensity?
- 10 times softer
- 20 times softer
- 100 times softer
- 200 times softer
Remember, the decibel is a logarithmic scale, so each increase or decrease of 10 is a factor of 10. A decrease of 20 dB, is a decrease of a factor of 100 in intensity.
Remember, the decibel is a logarithmic scale, so each increase or decrease of 10 is a factor of 10. A decrease of 20 dB, is a decrease of a factor of 100 in intensity
Remember, the decibel is a logarithmic scale, so each increase or decrease of 10 is a factor of 10. A decrease of 20 dB, is a decrease of a factor of 100 in intensity
Remember, the decibel is a logarithmic scale, so each increase or decrease of 10 is a factor of 10. A decrease of 20 dB, is a decrease of a factor of 100 in intensity
Which of the following determines the pitch of a sound?
- frequency
- wavelength
- wave speed
Pitch is how high or low a sound is. It is determined by frequency.
Pitch is how high or low a sound is. It is determined by frequency.
Pitch is how high or low a sound is. It is determined by frequency.
Which term is used to describe the idea that relative motion changes the frequency of a sound?
- propagation
- compression
- decibel levels
- The Doppler Effect
The Doppler effect can be heard when there is relative motion between a source and a listener.
The Doppler effect can be heard when there is relative motion between a source and a listener
The Doppler effect can be heard when there is relative motion between a source and a listener
The Doppler effect can be heard when there is relative motion between a source and a listener
Summary
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