20. Two sources are 5.4 cm apart and vibrate in phase at 6.0 Hz. A point on the third nodal line is 20.0 cm from one source and 26 cm from the other. a) Calculate the wavelength of the waves. [2 marks] b) Calculate the speed of the waves. [2 marks] 21. Two towers of a radio station are 0.6 km apart along an east-west line. The towers act as point sources radiating at a frequency of 1.0 x 10° Hz. Radio waves travel at a speed of 3.0 x 10% m/s. Determine the first (non-zero) angle at which the radio signal strength is at a maximum for listeners who are on a line 20.0 km north of the station (c = 3 x 10% m/s). [4 marks] 22. A lens that has an index of refraction of 1.51 is coated with a non-reflective coating that has an index of refraction of 1.75. Determine the minimum thickness for the film if it is to be non-reflecting for light of wavelength 5.60 x 102 nm in air. [2 marks]
20. Two sources are 5.4 cm apart and vibrate in phase at 6.0 Hz. A point on the third nodal line is 20.0 cm from one source and 26 cm from the other. a) Calculate the wavelength of the waves. [2 marks] b) Calculate the speed of the waves. [2 marks] 21. Two towers of a radio station are 0.6 km apart along an east-west line. The towers act as point sources radiating at a frequency of 1.0 x 10° Hz. Radio waves travel at a speed of 3.0 x 10% m/s. Determine the first (non-zero) angle at which the radio signal strength is at a maximum for listeners who are on a line 20.0 km north of the station (c = 3 x 10% m/s). [4 marks] 22. A lens that has an index of refraction of 1.51 is coated with a non-reflective coating that has an index of refraction of 1.75. Determine the minimum thickness for the film if it is to be non-reflecting for light of wavelength 5.60 x 102 nm in air. [2 marks]
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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![20. Two sources are 5.4 cm apart and vibrate in phase at 6.0 Hz. A point on the third nodal line is 20.0 cm from one source
and 26 cm from the other.
a) Calculate the wavelength of the waves. [2 marks]
b) Calculate the speed of the waves. [2 marks]
21. Two towers of a radio station are 0.6 km apart along an east-west line. The towers act as point sources radiating at a
frequency of 1.0 x 10° Hz. Radio waves travel at a speed of 3.0 x 10% m/s. Determine the first (non-zero) angle at which
the radio signal strength is at a maximum for listeners who are on a line 20.0 km north of the station (c = 3 x 10% m/s).
[4 marks]
22. A lens that has an index of refraction of 1.51 is coated with a non-reflective coating that has an index of
refraction of 1.75. Determine the minimum thickness for the film if it is to be non-reflecting for light of
wavelength 5.60 x 102 nm in air. [2 marks]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F51ee61e2-95ad-4ba6-8d63-c194d98f6522%2Ff2dd211b-b703-4e1b-946a-e462ffcc63b2%2F6vr829_processed.jpeg&w=3840&q=75)
Transcribed Image Text:20. Two sources are 5.4 cm apart and vibrate in phase at 6.0 Hz. A point on the third nodal line is 20.0 cm from one source
and 26 cm from the other.
a) Calculate the wavelength of the waves. [2 marks]
b) Calculate the speed of the waves. [2 marks]
21. Two towers of a radio station are 0.6 km apart along an east-west line. The towers act as point sources radiating at a
frequency of 1.0 x 10° Hz. Radio waves travel at a speed of 3.0 x 10% m/s. Determine the first (non-zero) angle at which
the radio signal strength is at a maximum for listeners who are on a line 20.0 km north of the station (c = 3 x 10% m/s).
[4 marks]
22. A lens that has an index of refraction of 1.51 is coated with a non-reflective coating that has an index of
refraction of 1.75. Determine the minimum thickness for the film if it is to be non-reflecting for light of
wavelength 5.60 x 102 nm in air. [2 marks]
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