Doppler Effect: You are driving along a highway at 25 m/s when you hear the siren of an emergency vehicle traveling at constant speed in the opposite direction on the other side of the highway. When the vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you the frequency becomes 1680 Hz. What is the speed of the vehicle? The speed of sound in air is 343 m/s.
A. 35 m/s
B. 32 m/s
C. 30 m/s
D. 41 m/s
E. 50 m/s
Answer: A
You might also like to view...
A current in a solenoid coil creates a magnetic field inside that coil. The field strength is directly proportional to:
a. Both A and B are valid choices. c. the coil area. b. the current. d. None of the above choices are valid.
If the newly discovered planet of Krypton has 100. times the mass of the Earth and 100. times the diameter of the Earth, what would be the period of a "low" orbiting satellite around Krypton?
A) 1.5 hours B) 1.5 × 103 hours C) 15. hours D) 1.5 × 102 hours E) 0.15 hours
An insulator has a negative electric charge of 2.4 × 10^ -17 C. How many electrons were added or removed?
a. 150 electrons removed b. 67 electrons removed c. 150 electrons added d. 67 electrons added
Art museums use weaker wires than those used in homes because paintings in museums
A) are suspended by pairs of vertical wires. B) are usually lighter in weight. C) are more firmly attached.