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- Lunar astronauts placed a reflector on the Moon's Surface, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. (a) To what accuracy in meters can the distance to the Moon be determined, if this time can be measured to 0.100 ns? (b) What percent accuracy is this, given the average distance to the Moon is 3.84108m ?In what range of electromagnetic radiation are the electromagnetic waves emitted by power lines in a country that uses 50-Hz ac current?Certain orientations of a broadcast television antenna give better reception than others for a particular station. Explain.
- At what distance does a 100-W lightbulb produce the same intensity of light as a 75-W lightbulb produces 10 m away? (Assume both have the same efficiency for converting electrical energy in the circuit into emitted electromagnetic energy.)(a) Calculate the range of wavelength for AM radio given its frequency range is 540 to 1600 kHz. (b) Do the same for the FM frequency range of 88.0 to 108 MHz.(a) A jet airplane with a 75.0 m wingspan is flying at 280 m/s. What emf is induced between wing tips if the vertical component 01 the Earth’s field is 3.00105T ? (b) Is an emf of this magnitude likely to have any consequences? Explain.
- What are the wavelengths of (a) X-rays of frequency 2.01017 Hz? (b) Yellow light of frequency 5.11014Hz ? (C) Gamma rays of frequency 1.01023Hz ?A 2.50-m-diameter university communications satellite dish receives TV signals that have a maximum electric field strength (for one channel) of 7.50 (V/m. (See Figure 24.28.) (a) What is the intensity of this wave? (b) What is the power received by the antenna? (c) If the orbiting satellite broadcasts uniformly over an area of 1.501013m2 (a large fraction of North America), how much power does it radiate? Figure 24.28 Satellite dishes receive TV signals sent from orbit. Although the signals are quite weak, the receiver can detect them by being tuned to resonate at their frequency.Which of the following statements is INCORRECT? The visible spectrum is a relatively small band of frequencies within the EM spectrum. The energy of an EM wave is proportional to the square of its amplitude. EM waves all travel at the same velocity in a vacuum. A resonant circuit can produce EM waves in all ranges of the EM spectrum. None of the above.
- The wavelength of an EM wave is measured to be 600 m. 1. What is the frequency of the wave? 2. What type of EM wave is it? ditor Suggestions: Showing (Ctrl) MWhat is the frequency of an EM wave thats has a wave length of 1mm? What type od EM wave is this?DETAILS OBINPHYS8 8.P.005. Compute the frequency (in MHz) of an EM wave with a wavelength of 4.7 in. (0.1194 m). MHz