Unit 1 Conceptual Multiple Choice Questions
Unit 1 Conceptual Multiple Choice Answers
Unit 1.1 Multiple Choice Questions - Waves
Unit 1.1 Multiple Choice Answers - Waves
Unit 1.3 Multiple Choice Questions - Sound
Unit 1.3 Multiple Choice Answers - Sound
Unit 1.5 Multiple Choice Questions - Doppler Effect
Unit 1.5 Multiple Choice Answers - Doppler Effect
Unit 2 - Multiple Choice - Electromagnetic Waves Questions
Unit 2 - Multiple Choice - Electromagnetic Waves Answers
Unit 2.1 Multiple Choice Extended Questions - Waves
Unit 2.1 Multiple Choice Extended Answers-Waves
Unit 3 Multiple Choice Questions
Unit 3 Multiple Choice Answers
 

Unit 1.5 Multiple Choice Questions - Doppler Effect

Multiple Choice

1. When an automobile moves towards a listener, the sound of its horn seems relatively
(A) low pitched
(B) high pitched
(C) normal
(D) No Change

2. When the automobile moves away from the listener, its horn seems
(A) low pitched
(B) high pitched
(C) normal
(D) No Change

3. A trumpet player is standing on a stage playing a single note. Which choice would result in you hearing a higher pitch than the trumpeter?
(A) Run very fast toward the trumpeter.
(B) Cover your ears.
(C) Play the sound much louder through a headphone.
(D) Get the trumpeter to point the horn at the sky.

4. Betty is running at 5 ms-1 toward a whistle, which is stationary. An identical whistle is approaching Bob at 5 ms-1. Which statement about the pitch of the whistle is correct?
(A) Betty and Bob both hear a pitch which is higher than normal.
(B) Betty and Bob both hear a pitch which is lower than normal.
(C) Betty perceives the pitch to be higher and Bob perceives it to be lower than normal.
(D) Betty perceives the pitch to be lower and Bob perceives it to be higher than normal.

5. An aircraft is moving away from you at half the speed of sound, which, on that day is about 340 ms-1. The jet engines make a sound that is primarily about 300 Hz. What is the apparent frequency of the jet engines?
(A) 150 Hz
(B) 200 Hz
(C) 470 Hz
(D) 600 Hz

6. A fast-moving car is sounding its horn as it moves by you. What will you observe just as the car passes by you?
(A) the pitch gets lower
(B) the pitch gets higher
(C) the pitch alternates behind high and low, repeatedly
(D) the pitch is unchanged

7. A trumpet player is standing on a stage playing a single note. Which choice would result in you hearing a higher pitch than the trumpeter?
(A) Run very fast toward the trumpeter.
(B) Cover your ears.
(C) Play the sound much louder through a headphone.
(D) Get the trumpeter to point the horn at the sky. 4

8. A police car travelling at 30.0 ms-1 sounds its 525 Hz siren as it approaches a person standing on the side of the road. If the speed of sound is 344 ms-1, what frequency is heard by the person?
(A) 483 Hz
(B) 525 Hz
(C) 555 Hz
(D) 575 Hz

9. An ambulance approaches an observer at 31.5 ms-1 on a day when the speed of sound is 341 ms-1. If the frequency heard is 525 Hz, what is the actual frequency of the siren?
(A) 477 Hz
(B) 481 Hz
(C) 573 Hz
(D) 578 Hz

10. High frequency sound waves are directed at an artery. Reflected waves have a different frequency than the incident waves due to the movement of blood cells in an artery. From this difference the speed of blood cells can be determined. This is an application of which wave property?
(A) Diffraction
(B) Doppler Effect
(C) Interference
(D) Refraction

11. The Doppler effect produces apparent changes in
(A) loudness
(B) frequency
(C) amplitude
(D) velocity

12. A distant star is known to produce a frequency of 6.00×10-14Hz. If it is moving away from the Earth at 5.35×10-6m/s, what wavelength is observed on Earth?
(A) 8.92×10-9 m
(B) 4.91×10-7 m
(C) 5.09×10-7 m
(D) 5.73×10-7 m

13. A car horn has a frequency of 400 Hz. The car is moving away from an intersection at 20 ms-1. The frequency heard by a woman standing at the intersection could be:
(A) 390 Hz
(B) 400 Hz
(C) 410 Hz
(D) 420 Hz

14. An observer approaches a stationary 1000 Hz sound source at twice the speed of sound. What frequency does the observer hear?
(A) 4,000 Hz
(B) 3,000 Hz
(C) 2,000 Hz
(D) none of these5

15. What frequency do you hear if you are traveling at 15 ms-1 toward a train with a 750 Hz whistle? The train is moving away from you at 25 ms-1and the temperature is 15°C.
(A) 668 Hz
(B) 729 Hz
(C) 774 Hz
(D) 845 Hz

16. What is the frequency heard by a stationary observer when a train approaches with a speed of 30 ms-1? The frequency of the train horn is 600 Hz and the speed of sound is 340 ms-1.
(A) 570 Hz
(B) 630 Hz
(C) 653 Hz
(D) 658 Hz

Concept by Kishore Lal. Programmed by Kishore Lal... Copyright © 2015 Kishore Lal. All rights reserved.