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- The 305-m-diameter Arecibo radio telescope pictured in Figure 4.20 detects radio waves with a 4.00-cm average wavelength. (a) What is the angle between two just-resolvable point sources for this telescope? (b) How close together could these point sources be at the 2 million light-year distance of the Andromeda Galaxy? Figure 4.20 A 305-m-diameter paraboloid at Arecibo in Puerto Rico is lined with reflective material, making it into a radio telescope. It is the largest curved focusing dish in the world. Although D for Arecibo is much larger than for the Hubble Telescope, it detects radiation of a much longer wavelength and its diffraction limit is significantly poorer than Hubble’s. The Arecibo telescope is still very useful, because important information is carried by radio waves that is not carried by visible light. (credit: Jeff Hitchcock)(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically involve integrating or extending the concepts presented thus far.) . Just before the Sun sets, a driver encounters sunlight reflecting off the side of a building. Will Polaroid sunglasses stop this glare? Why or why not?The purpose of a grating or prism in a spectrometer is to a. separate the white light into individual wavelngths. b. allow the light into the spectrometer. c. filter out the background or stray light. d. allow calibration of the spectroscope.
- 1. An LED emit light waves whose wavelenghs is 490nm. What is the frequency for this light? (ans: 6.12x1014Hz) 2. A radio station has broadast at 107.5 MHz. What is the wavelengh of the radio waves that are produced? (ans 2.79m) 3. For cellphone 4G LTE operates at a frequency 1.90 GHz. What is the corresponding wavelengh the cellphone operates on? (15.8 cm) Show Work0000 О A point source emits light isotropically (i.e. with the same intensity in all directions). Let I be the luminous intensity at a distance d from the source. The intensity at a distance 2d is equal to: A. 21 B. I C. 1/4 O D. 1/2 OE. I/16A hot plasma has a plasma frequency of 1 MHz. A radio wave of frequency 900kHz is incident on the plasma. What happens to the wave? 16 Select one: O a. The wave passes through the plasma and experiences dispersion O b. The wave is refracted by the plasma O c. The wave is reflected and an evanescent wave forms inside the plasma O d. An evanescent wave is reflected from the plasma
- An infrared lamp has a wavelengh of 1230 nm. Solve for the frequency of the lamp if the speed of light is 3X108m/s. ans: 2.44X1014 Hz A UV light has a frequency of 8X1014Hz. solve for the wavelengh of the lamp if the speed of light is 3X108m/s. ans: 375nm Show WorkCalculate the luminous flux of a ceiling-mounted spot light having an intensity of 200cd, and lighting a religious icon mounted on a table 600mm from the floor. Height of the prayer room from floor to ceiling is 2100mm. a. 635 lm b. 640 lm c. 645 lm d. 650 lmImagine you are at a location where some incident light source provides light at an intensity of 10 W/m^2 Now you move to double your distance from the light source (aka your distance is 2 times its initial value) What is the intensity of the light at this new location (in units of W/m^2, provide only the number)? hp & %23 24 7 8. 3 4. y u e r j k b .. .. * 00 In
- S Schoology S Home | Schoology choology A bcps.schoology.com/common-assessment-delivery/start/4865831278?action3Donresume&submissionld%3D514311155 S Schoology 9 Schoology v waves. Students can use a pan of water to model the behavior of sound waves. Sound waves are examples of matter electromagnetic 3 4 5 6 7 103 MP HW 12 - PHY 122:0001-Phy Eng & Physical Sci |I (202 X C Unpolarized Light With Intensity 320 W/m? Passes F. | C X b My Questions | bartleby How Far l'll Go / Go the Distance - YouTube Music -> courses.maine.edu/d2l/le/content/143857/viewContent/5176217/View G =S 2 : 3 brightspace O alejjcink N primewire b Bartleby C Chegg IX Mathway limnu logo E Reading list MEE120 Calculator Create The Love new shadowplay nickpick >> Other bookmarks ewo Course TIOME Contet Course RESourcES ASSESSIMENTS TOOIS ieip Table of Contents > Module 13: Wave Optics I > MP HW 12 MP HW 12 口 - > I Review | Constants Unpolarized light with intensity 310 W/m² passes first through a polarizing filter with its axis vertical, then through a second polarizing filter. It emerges from the second filter with intensity 141 W/m2. Part A You may want to review (Pages 897 - 898) . What is the angle from vertical of the axis of the second polarizing filter? Express your answer to two significant figures and include the…632.8 nmnm (wavelength of red light from a helium-neon laser) Express your answer using three significant figures. 12.24 cmcm (wavelength of a microwave oven) Express your answer using three significant figures.