Sound waves travel at $350 \text{ m/s}$ through warm air and at $3500 \text{ m/s}$ through brass. Which of the following is correct about the wavelength of a $700 \text{ Hz}$ acoustic wave as it enters brass from warm air?
- AIt increases by a factor of $20$
- BIt decreases by a factor of $10$
- CIt increases by a factor of $10$
- DIt decreases by a factor of $20$
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