College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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I need help with number 15

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13. A wave takes o.25 second to complete four cycles. What is the wave's frequency and
Period?
14. A wave takes 10 seconds to complete two complete cycles.
(a) How long does it take to complete one cycle?
(b) What is its period?
(c) What is its frequency?
15. A certain water wave has a wavelength of 25 m and a frequency of 0.25 Hz. What is its
Velocity?
16. Two sailboats are anchored 12 m apart. As a series of waves passes, the boats bob up and
down but when one is up, the other
s always down. What wavelength could produce this effect?
17. As a sailor on one of the boat in problem #16, you notice that you go from the highest
position to the lowest position and back to the highest in 4 seconds. (a) What was the period of
the wave? (b) What was the frequency? (c)) What was its velocity? (Hint: you need to use your
answer from problem # 16)
18. The laser in a compact disk (CD) player uses light with a wavelength of 780 nm. What is the
frequency of this light? (Hint: convert nanometers to meters; 1m = 10'nm .
19. NPR (National Public Radio) broadcasts at 89.3 MHz (or 89300000 Hz). Radio waves travel
at the speed of light, which is 3X 10" m/s . What is the wavelength that NPR uses to broadcast
its news?
20. What is the energy of an ultraviolet photon having a wavelength of 1. 18 X 10 m?
(Hint 1: first usec = f, where c = 3 X 10°m/s, to find the frequency).
(Hint 2: then substitute the value of frequency in E = hf, where h = 6. 626X10".s
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