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- 1)How long does it take a radio signal from Earth to reach the Moon, which has an orbital radius of approximately 3.84×10^8 m? (Express your answer to three significant figures.)Why is the x-component of the NW direction negative, but not its y-component?Consider a road that runs parallel to the line connecting a pair of radio towers that transmit the same station (assume that their transmissions are synchronized), which has an AM frequency of 1000 kilohertz. If the road is 5 kilometers from the towers and the towers are separated by 400 meters, find the angle θ to the first point of minimum signal (m=0). Hint: A frequency of 1000 kilohertz corresponds to a wavelength of 300 meters for radio waves.
- Due: Fri, May 21 Assignment Score: 52.9% Resources Give Up? O Hint Check Answer uestion 12 of 17 Find the frequency f in terahertz of visible light with a wavelength of 493 nm in vacuum. THz f = %3D What is the wavelength å in centimeters of electromagnetic microwave radiation whose frequency is 8.17 GHz? cm(a) The distance to a star is approximately 4.97 × 10¹8 m. If this star were to burn out today, in how many years would we see it disappear? years (b) How long does it take sunlight to reach Earth? minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 x 105 km.) SThe average EarthSun distance is 1.00 astronomical unit (AU). At how many AUs from the Sun is the intensity of sunlight 1/25 the intensity at the Earth?
- When the sun is directly overhead, it produces an illuminance of 105,000 lux on a horizontalsurface on the earth. It has an angular diameter of 0.53 degrees as seen from the earth, andthe distance from the sun to the earth is 150*10^6km. What is the average luminance of thesun?The average Earth-sun distance is 1.00 au. At how many AUs from the Sun is the intensity of the sunlight 1/64 the intensity at the Earth?The ratio of velocities of visible light of wavelength 5000 A and infrared ray of wavelength 8500 A in free space is, (a) Greater than 1 (b) Less than 1 (c) Equal to 1 (d) Infinite
- A) Suppose a star is 4.15 ✕ 1018 m from Earth. Imagine a pulse of radio waves is emitted toward Earth from the surface of this star. How long (in years) would it take to reach Earth? B) The Sun is 1.50 ✕ 1011 m from Earth. How long (in minutes) does it take sunlight to reach Earth? C) The Moon is 3.84 ✕ 108 m from Earth. How long (in s) does it take for a radio transmission to travel from Earth to the Moon and back?(a) Suppose a star is 8.59 x 1018 m from Earth. Imagine a pulse of radio waves is emitted toward Earth from the surface of this star. How long (in years) would it take to reach Earth? years (b) The Sun is 1.50 x 1011 m from Earth. How long (in minutes) does it take sunlight to reach Earth? minutes (c) The Moon is 3.84 x 108 m from Earth. How long (in s) does it take for a high-intensity laser beam to travel from Earth to the Moon and back?Scientists use laser range finding to measure the distance to the moonwith great accuracy. A very brief (100 ps) laser pulse, with a wavelengthof 532 nm, is fired at the moon, where it reflects off an array of 100 4.0-cm-diameter mirrors placed there by Apollo 14 astronauts in 1971. The reflected laser light returns to earth, where it is collected by a telescope and detected. The average earth-moon distance is 384,000 km. The laser beam spreads out on its way to the moon because of diffraction, reaching the mirrors with an intensity of 300 W/m2. The reflected beam spreads out even more on its way back because of diffraction due to the circular aperture of the mirrors.a. What is the round-trip time for the laser pulse to travel to the moon and back?b. If we want to measure the distance to the moon to an accuracy of 1.0 cm, how accurately must the arrival time of the returning pulse be measured?c. Because of the spread of the beam due to diffraction, the light arriving at earth from one…