Question: The motion detector used in a physics lab sends and receives (40 mathrm{kHz}) ultrasonic pulses. A pulse goes out, reflects off the object being measured,

The motion detector used in a physics lab sends and receives $40 \mathrm{kHz}$ ultrasonic pulses. A pulse goes out, reflects off the object being measured, and returns to the detector. The lab temperature is $20^{\circ} \mathrm{C}$.

a. What is the wavelength of the waves emitted by the motion detector?

b. How long does it take for a pulse that reflects off an object $2.5 \mathrm{~m}$ away to make a round trip?

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