Question

3. Violating the six feet rule, a screaming youth skateboards toward a stationary physics student. The source frequency of the youth's scream is 750.0Hz, as shown below. The Doppler shift (Af=f'-fo) for the observed sound frequency is +15.0Hz, Treat sound waves as spherical and assume the speed of sound, Vsound, is 343.0 m/s at this location. (1 pt each) i. How fast is the skateboarder moving toward the observer? Student Fearless Youth (observer) (source) ii. As the skateboarder passes by the student, he accelerates to a final speed of 10.0m/s. At this new speed, determine the sound frequency heard by the student as the youth skateboards away at 10.0m/s. Fearless Youth Student (source) (observer)

Answer 1

f = 750Hz. Vround - 343m/s. Sourth as the source is mo Which Af = f - fox fr 15H7 + 750Hz f = footer 765Hz towards the observer E . forserver is stationary Vsoune fso Vround Vscourte Source. 343 750, = 765 343- Vrance 343-Vsource = 780 343 765