Physics Review Question

Unit: waves
Year: 1993 Question#: 44
Question: The distance between successive antinodes in the standing wave pattern shown below is equal to:


(1 ) 1 wavelength
(2 ) 2 wavelengths
(3 ) 1/2 wavelength
(4 ) 1/3 wavelength

What is this question really asking?


Explanation by: Lindsay K

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Answer 1
1) 1 wavelength

INCORRECT

Successive antinodes would be from the peak or trough of wave to the peak or trough of the other wave. Remember one complete sin wave or cosine wave is one wavelength. You see the distance between the successive antinodes is 1/2 a wavelength, not 1 wavelength. So 1 wavelength is not the correct answer.


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Answer 2
2) 2 wavelengths

INCORRECT

Successive antinodes would be from the peak or trough of wave to the peak or trough of the other wave. Remember one complete sin wave or cosine wave is one wavelength. You see the distance between the successive antinodes is 1/2 a wavelength, not 2 wavelengths. So 2 wavelengths is not the correct answer.


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Answer 3
3) 1/2 wavelength

CORRECT

Successive antinodes would be from the peak or trough of wave to the peak or trough of the other wave. Remember one complete sin wave or cosine wave is one wavelength. You see the distance between the successive antinodes is 1/2 a wavelength, so this would be the correct answer.


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Answer 4
4) 1/3 wavelength

INCORRECT

Successive antinodes would be from the peak or trough of wave to the peak or trough of the other wave. Remember one complete sin wave or cosine wave is one wavelength. You see the distance between the successive antinodes is 1/2 a wavelength, not 1/3 wavelength. So 1/3 wavelength is not the correct answer.


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What's this question really asking?

What are antinodes and can you recognize one wavelength. return to top

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