IB · C · multiple choice
Wave behaviour · Question 2
Wave behaviour · Original GioPhysics question with a detailed, mark-by-mark answer guide.
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multiple choice1 mark
A sound wave of frequency 256 Hz travels through air at 340 m s⁻¹ and then passes into water, where its speed is 1500 m s⁻¹. What are its frequency and wavelength in the water?
- A
256 Hz and 1.33 m
- B
256 Hz and 5.86 m
- C
1130 Hz and 1.33 m
- D
58 Hz and 5.86 m
Ready to self-mark?Reveal the detailed answer guide
Answer overviewCorrect answer: B — 256 Hz and 5.86 m
01
1 markAnswer and reasoning
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is B: 256 Hz and 5.86 m
- 2
The frequency is fixed by the source and does not change at a boundary, which eliminates C and D at once. The wavelength changes with the speed: 1500/256 = 5.86 m.
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