From Unit III, we\'re focusing on (1) the factors that affect fluid flow, (2) re

Question

From Unit III, we're focusing on (1) the factors that affect fluid flow, (2) resonance, and (3) the propagation of waves. So think back to what you already know to answer the following question: When a 2 kHz sound wave travels from medium A to medium B, its wavelength gets shorter. What will happen when a 20 kHz sound wave travels from medium A to medium B? Select all that are correct. The wavelength of the 20 kHz sound wave will be shorter in medium B than it was in medium A. The period of the 20 kHz sound wave will decrease in medium B compared to its period in medium A. The period of the 20 kHz sound wave will increase in medium B compared to its period in medium A. The 20 kHz sound wave will travel more quickly in medium B than it did in medium A. The wavelength of the 20 kHz sound wave will be longer in medium B than it was in medium A. The 20 kHz sound wave will travel more slowly in medium B than it did in medium A.

Explanation / Answer

f1 = 2 kHz

f = v/lamda

lamdaA1 > lamdaB1

vA1 > vB1

f2 = 20 kHz

ladmaA2 > lamdaB2

vA2 > vB2

f = 1/T

TA = TB

(1),(6) are correct

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