I don't know why B for number 757 is the right answer. I used the f (observer) = (v + v (observer)/ v) x f (sound) but I got 10/11 x wavelength of sound
According to the solutions in the back Examkrackers tells to use a different equation v/c = change in wavelength / wavelength of the source. Im so confused...
If you solve for frequency the observed frequency is 11/10 of original frequency and with the inverse relation of wavelength and frequency the wavelength is 10/11 of the original wavelength. This is closest to 9/10 I think
If you solve for frequency the observed frequency is 11/10 of original frequency and with the inverse relation of wavelength and frequency the wavelength is 10/11 of the original wavelength. This is closest to 9/10 I think
Yeah I agree. Only two of the choices show the frequency decreasing, and one is a very dramatic decrease. That leaves 9/10 as the only reasonable choice.
This is an error, as the doppler effect equation is
the source is stationary, receiver is moving, therefore it should be 10/11 rather than 9/10, though using 9/10 will get you extremely close to the correct answer.
This is an error, as the doppler effect equation is
the source is stationary, receiver is moving, therefore it should be 10/11 rather than 9/10, though using 9/10 will get you extremely close to the correct answer.
It could be intentional, especially since they give the option of 11/10. Some may incorrectly select 11/10 when they look for 10/11. I have noticed that correct answers are sometimes approximate or similar to exact answer.
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