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level: 12/29/2020

Questions and Answers List

Question	Answer
Two separated sources emit sinusoidal traveling waves that have the same wavelength λ and are in phase at their respective sources. One travels a distance f1 to get to the observation point while the other travels a distance f2. The amplitude is a minimum at the observation point if f1 − f2 is: A. an odd multiple of λ/2 B. an odd multiple of λ/4 C. a multiple of λ D. an odd multiple of π/2 E. a multiple of π	A , Chapter 16: WAVES – I, Q 49
When a certain string is clamped at both ends, the lowest four resonant frequencies are measured to be 100, 150, 200, and 250 Hz. One of the resonant frequencies (below 200 Hz) is missing. What is it? A. 25 Hz B. 50 Hz C. 75 Hz D. 125 Hz E. 225 Hz	B, Chapter 16: WAVES – I, Q 58
The Sun is about 1.5 × 1011 m away. The time for light to travel this distance is about: A. 4.5 × 1018 s B. 8 s C. 8 min D. 8 hr E. 8 yr	C, Chapter 33: ELECTROMAGNETIC WAVES, Q 10
A concave spherical mirror has a focal length of 12 cm. If an object is placed 6 cm in front of it the image position is: A. 4 cm behind the mirror B. 4 cm in front of the mirror C. 12 cm behind the mirror D. 12 cm in front of the mirror E. at infinity	C, Chapter 34: IMAGES, Q 28
Suppose A = BC, where A has the dimension L/M and C has the dimension L/T. Then B has the dimension: A. T/M B. L2/TM C. TM/L2 D. L2T/M E. M/L2T	A, Chapter 1: MEASUREMENT, Q 27