College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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The intensity of light decreases as the inverse square of the distance from the source. Does this mean that light energy is lost? Explain.
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- 3. The intensity of an electromagnetic wave is 2.85 kW/m2. The wave strikes perpendicular to a flat, 312 m2 surface that reflects 23% of its intensity and absorbs the rest. a) Find the magnitude of the force that the wave exerts on this surface. b) Find the magnitude of the electric field for this wave.arrow_forwardWhich of the following is least reasonable regarding light waves? a) Ultraviolet light has a shorter wavelength and lower frequency than visible light. b) Frequency is equal to the speed of the wave divided by the wavelength of the wave. c) An apple which appears red in white light would appear black when illuminated by blue light. d) Light visible to the human eye is the part of the electromagnetic spectrum with wavelengths roughly in the range of 400-700 nanometers. e) A banana appears yellow because it reflects red and green colors while absorbing blue.arrow_forwardQUESTION 5 The distance between Planet X and a star is 1.2 x 1011 m. At the surface of Planet X, the average intensity of the radiation from the star is 5355 W/m2. If the star radiates isotropically, which of the following is the average power of the star? 5.47 x 1027 warrow_forward
- 10. A beam of light polarized along the y axis and moving along the +z axis passes through two polarizing sheets with axes of polarization oriented 30° and 70° measured clockwise from the positive direction of the y axis. The final intensity of the beam is found to be 61 W/m². What is the initial beam intensity? (1) 280 W/m² (2) 700 W/m² (3) 200 W/m² (4) 50 W/m² .2 (5) 140 W/m² 11. Light of wavelength 520 nm is incident perpendicularly on a diffraction grating having 200 lines/mm. What is the highestarrow_forward4. The magnetic field strength of a wave in a vacuum is given by H= 0.2 cos(10°t - By) a, A/m. In this situation. a) Find the phase constant and wavelength. b) Find the phase velocity and give the direction of wave propagation c) Give the intensity of the electric field for y=1 cm and = 0.1 ns. d) Define the polarization of the wave on the x-y-z plane and draw the polarization site. 3arrow_forward36.) Which of the following is true of electromagnetic waves?a. The frequency is the number of vibrations needed to produce a wavelength. b. As the frequency increases, so does the wavelength. c. The frequency of an electromagnetic wave equals the frequency of the vibrating charge that produces the wave.arrow_forward
- Vertically polarized light of intensity lo is incident on a polarizer whose transmission axis is at an angle of 70° with the vertical. If the intensity of the transmitted light is measured to be 0.34W/m², the intensity lo of the incident light is O 1.71 W/m2 O 0.99 W/m² O 0.43 W/m2 O 2.91 W/m²arrow_forwardAn electromagnetic wave is allowed to reflect from a mirror in a measurement of radiation pressure. If Erms is doubled while the wave frequency is cut in half, then the radiation pressure will a. remain the same. b. quadruple. c. double. d. be cut in half.arrow_forward
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