The motion detector used in a physics lab sends and receives 39 ultrasonic pulse

Question

The motion detector used in a physics lab sends and receives 39 ultrasonic pulses. A pulse goes out, reflects off the object being measured, and returns to the detector. The lab temperature is 20.Part A What is the wavelength of the waves emitted by the motion detector? Express your answer using two significant figures. = SubmitMy AnswersGive Up Part B How long does it take for a pulse that reflects off an object 2.6 away to make a round trip? Express your answer using two significant figures. = SubmitMy AnswersGive Up

Explanation / Answer

In dry air at 20 °C (68 °F), the speed of sound is v=343 meters per second (1,125 ft/s). A. Wavelength ? = v / f ? = 343 / 39000 = 8.7949 * 10^-3 m = 8.7949 mm B. d=2.6m t = 2 * d/v t = 2 * 2.6/343 = 0.015160 s

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---