Does a radio station broadcast its radio waves with a power of 50,000 W. What would be the intensity of this signal if it is received on a planet orbiting Proxima Centuri, the closest star to our Sun, at 4.243 ly away?
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Does a radio station broadcast its radio waves with a power of 50,000 W. What would be the intensity of this signal if it is received on a planet orbiting Proxima Centuri, the closest star to our Sun, at 4.243 ly away?
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- What is the energy of photons (joules) emitted by an 88.5 MHz FM radio station?Compute the wavelength of the radio waves from the following stations. (a) an AM station operating at a frequency of 780 kHzm(b) an FM station with a frequency of 96.9 MHzmA local radio station broadcasts radio waves at 99.7 MHz. Unlike sound, radio waves can pass into outer space, because they are disturbances not in air molecules but in the e-m fields that exist even in the vacuum of space. It's energy traveling independent of matter. a. When that radio wave hits you, how many pulses (wave crests) of em radiation hit you per minute (60 seconds)? (reminder: M = 10 6) b. Radio waves move at the speed of light (c), how far apart is each wave crest (wavelength)? c. If we boosted the signal strength so that station could be heard on the moon, would either the wavelength or frequency change?
- Compute the wavelength of the radio waves from the following stations. (b) an FM station with a frequency of 96.5 MHzA police officer's radar gun emits radio waves at a frequency of 10.3 GHz. What is the difference in the frequencies reflected back to the radar gun by a car traveling at the 45 mph speed limit and a car travelling 9 mph faster? Assume that the cars are both headed directly away from the stationary officer. difference between frequencies:Remember the wave equation is v = lambda - f For electromagnetic waves traveling in a vacuum, they all travel at the speed of light c = 2.998 * 10 ^ 8 * m / s . An ultraviolet wave from the Sun traveling at the speed of light has a wavelength of 3 * 10 ^ - 8 * m . Calculate the frequency of this wave 8.85 * 10 ^ 15 * Hz; 2.33 * 10 ^ 13 * Hz; 9.99 * 10 ^ 13 * Hz; 9.99 * 10 ^ 15 * Hz
- We use sunscreen to protect ourselves from the UV rays of the sun or a "lead coat"to protect ourselves from s-rays, but we do not protect ourselves when standing in front of a microwave. why is it that UV and X rays are harmful to life but microwaves arentIt has been proposed that spacecraft could be propelled by emitting intense beams of EM radiation from their tails rather than high-velocity chemical exhaust. This could reduce the fuel load required, which is very large for chemical rockets. Suppose a spacecraft (M = 250,000 kg) is floating in empty space at rest relative to a nearby space station. It then emits a very powerful 10.0 MW beam of laser light for one full day from its tail. Calculate the velocity acquired by the vehicle relative to the space station due to this emission of EM radiationWhat is the wavelength, in fm (femtometers, or 10^-15 m), of a proton travelling at 90% of the speed of light?