MCAT Physics Question — Pitch
- May 07, 2018
- MCAT Question of the Day
I. as the punk-rocker moves away from the listener.
II. as the listener moves away from the punk-rocker.
III. under no circumstances, as the pitch of the recording is fixed when the recording is made.
A. I only
B. II only
C. I and II only
D. III only
Click for Explanation
Where f’ is the apparent frequency of the sound, f is the true frequency of the sound, v is the speed of sound in the surrounding medium, vd is the velocity of the sound detector, and vs is the velocity of the sound source. While specific numbers may be calculated, qualitatively a source and detector moving towards each other will hear a pitch higher than the actual pitch of the sound. If only the source or the detector is moving, the actual apparent pitch, f’, is slightly different but still higher than stationary sources and detectors. Sources and detectors moving away from each other experience a lower apparent pitch. Immobile sources and detectors experience the true frequency of the sound. I and II (or answer C) are correct.
- I only, incorrect, II is also correct.
- II only, incorrect, I is also correct.
- I and II, correct.
- III only, incorrect, This answer choice disregards the doppler effect.
Want more MCAT practice?
We’ve got options for every schedule and learning style!
From the best online MCAT course created by top instructors with 524+ MCAT scores to the most representative full-length practice exams and private tutoring, we can custom tailor your MCAT prep to your goals!
Not sure which option is right for you? Schedule a free MCAT consultation with an MCAT expert using the form below. No obligation, just expert advice.
Search the Blog
Free ConsultationSchedule Now
Free MCAT Practice AccountNeed great MCAT practice?
Get the most representative MCAT practice possible when you sign up for our free MCAT Account, which includes a half-length diagnostic exam and one of our full-length MCAT practice exams.Learn More