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- On the Moon’s surface, lunar astronauts placed a comet reflector, off which a laser beam Is periodically reflected. The distance to the Moon is calculated from the round-trip time. What percent correction Is needed to account for the delay in time due to the slowing of light in Earth’s atmosphere? Assume the distance to the Moon is precisely 3.84108 m and Earth’s atmosphere (which varies in density with altitude) is equivalent to a layer 30.0 km thick with a constant index of refraction n= l.000293.From his measurements, Roemer estimated that it took 22 mm for light to travel a distance equal to the diameter of Earth’s orbit around the Sun. (a) Use this estimate along with the known diameter of Earth’s orbit to obtain a rough value of the speed of light. (b) Light actually takes 16.5 mm to travel this distance. Use this time to calculate the speed of light.The 300-m-diameter Arecibo radio telescope pictured in Figure 27.28 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?
- 1. Light having a certain frequency, wavelength, and speed is traveling through empty space. If the frequency of this light| were doubled, then A. its wavelength would remain the same, but its speed would double. B. its wavelength would remain the same, but its speed would be halved. C. its wavelength would be halved, but its speed would double. D. its wavelength would be halved, but its speed would remain the same. E. both its speed and its wavelength would be doubled.A device that analyzes light by spreading it out according to wavelength is called a(n) a. interferometer. b. camera. c. photometer. d. spectrograph.Radio telescopes have poor resolving power because a. their diameters are so large. b. the energy they receive is not electromagnetic radiation. c. radio waves have long wavelengths. d. a and b are true. e. none of the above are true.
- 2. With the help of Maxwell’s equations, explain the process of wave generation. What is Poynting vector? Explain each part of mathematical equation of the Poynting theorem for EM waves. .2. The nearest star to earth is the Proxima Centauri. It is approximately 4.2 lightyears away from our planet. a) Express this distance in km and in the astronomical unit. b) Calculate the time that it will take for this star's light to reach earth. 3. Find the weights of gelatin and butter contained in a cubic box with a side dimension of 0.03 em. Gelatin has a density of 79 lb/ft³ while butter has a density of 53 lb/f³.1. Describe different types of electromagnetic waves. 2. If the visible light wavelength is changed? What else has changed? 3. A light ray traveling through air meets the boundary with glass. What happens to the light wave? What happens to the angle of refraction? 4. Describe what additive and subtractive color light theory is. If an object is a certain color, what light is it reflecting on? What light is it observing? 5. What is the difference between transparent, translucent, and opaque? Give examples of each of the following. 6. Indicates 2 variations of the concave lens and convex lens. 7. What is the ray model of light? 8. What is the color theory of color printers?
- 1. Red light is curved the most.2.EM waves are 'transverse' waves.3. Frequency is measured in seconds.4. A moving electric field produces a magnetic field? True or False?In a radio interferometer with two dishes, the distance between the two dishes determines the a. magnifying power b. light-gathering power. c. resolving power. d. level of interference from terrestrial radio sources. e. energy distribution.Light is an example of what type of wave? a. Transverse wave b. Electromagnetic wave c. Heatwave d. Longitudinal wave 2. The ratio of the height of the image to the height of the object is referred to as: a. H-index b. Index of interference c. Index of diffraction d. Index of reflection e. None of the above 3. The act of assuming that the rays coming from a distant object are parallel a. Taylor Approximation b. Standard Approximation c. Ray Approximation d. Paraxial Approximation 4. A very narrow beam of intense light is said to be near: a. Dichromatic b. Trichromatic c. Monochromatic d. None of the above 5. The branch of physics that deals with the nature and propagation of light a. Optical science b. Optics c. Photonics d. Radiology 6. The term refers to the “bouncing” of light as it strikes a smooth and even surface a. Refraction b. Rarefaction c. Reflection d. Diffraction 7. The term refers to the…