How things work college course/Waves (Physics Classroom)

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This quiz was inspired by: http://www.physicsclassroom.com/class/waves/Lesson-1/Waves-and-Wavelike-Motion

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1. Pulse interference 1.svgThese two pulses will collide and produce

positive interference
negative interference
positive diffraction
negative diffraction

2. Pulse interference 2.svgThese two pulses will collide and produce

positive interference
negative interference
positive diffraction
negative diffraction

3. Pulse interference 4.svgThese two pulses will collide and produce

positive interference
negative interference
positive diffraction
negative diffraction

4. Octave notes graphed.svg Two signals (dashed) add to a solid

octave
fifth
dissonance

5. Dissonant pitches graphed.svg Two signals (dashed) add to a solid

octave
fifth
dissonance

6. Perfect fifth notes graphed.svg Two signals (dashed) add to a solid

octave
fifth
dissonance

7. Why don't we hear beats when two different notes on a piano are played at the same time?

The beats happen so many times per second you can't hear them.
The note is over by the time the first beat is heard
Reverberation usually stifles the beats
Echo usually stifles the beats

8. A tuning fork with a frequency of 440 Hz is played simultaneously with a tuning fork of 442 Hz. How many beats are heard in 10 seconds?

20
30
40
50
60

9. If you start moving towards a source of sound, the pitch becomes

higher
lower
unchanged

10. If a source of sound is moving towards you, the pitch becomes

higher
lower
unchanged

11. Why do rough walls give a concert hall a “fuller” sound, compared to smooth walls?

Rough walls make for a louder sound.
The difference in path lengths creates more reverberation.
The difference in path lengths creates more echo.

12. People don't usually perceive an echo when

it arrives less than a tenth of a second after the original sound
it arrives at exactly the same pitch
it arrives at a higher pitch
it arrives at a lower pitch
it takes more than a tenth of a second after the original sound to arrive

13. A dense rope is connected to a rope with less density (i.e. fewer kilograms per meter). If the rope is stretched and a wave is sent along high density rope,

the low density rope supports a wave with a higher frequency
the low density rope supports a wave with a lower frequency
the low density rope supports a wave with a higher speed
the low density rope supports a wave with a lower speed

14. What happens to the wavelength on a wave on a stretched string if the wave passes from lightweight (low density) region of the rope to a heavy (high density) rope?

the wavelength gets longer
the wavelength stays the same
the wavelength gets shorter

15. When a wave is reflected off a stationary barrier, the reflected wave

has lower amplitude than the incident wave
has higher frequency than the incident wave
both of these are true

16. Comparing a typical church to a professional baseball stadium, the church is likely to have

reverberation instead of echo
echo instead of reverberation
both reverberation and echo
neither reverberation nor echo

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