Wave X completes 8 oscillations in

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

0.032\,\text{s}

, while wave Y completes 9 oscillations in the same time. A simultaneous displacement–position snapshot shows crest–to–crest separations of

0.48\,\text{m}

for X and

0.38\,\text{m}

for Y. Which statement is correct? (a) Wave Y travels faster and the beat frequency is about

31\,\text{Hz}

(b) Wave X travels faster and the beat frequency is about

19\,\text{Hz}

31\,\text{Hz}

(d) Wave Y travels faster and the beat frequency is about

25\,\text{Hz}