SAT Subject Physics Practice Question 109: Answer and Explanation

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Question: 109

4. What is the wavelength of a wave with period 2 s and speed 2 cm/s ?

A. 0.25 cm
B. 0.5 cm
C. 1 cm
D. 2 cm
E. 4 cm

Correct Answer: E

Explanation:

From the equations λf = v and f = I/T, we get λ = vT = 2(cm/s)(2 s) = 4 cm.

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