Stars other than our sun normally appear featureless when viewed through telescopes. Yet astronomers can readily use the light from these stars to determine that they are rotating and even measure the speed of their surface. How do you think they can do this?
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Stars other than our sun normally appear featureless when
viewed through telescopes. Yet astronomers can readily use the light
from these stars to determine that they are rotating and even measure
the speed of their surface. How do you think they can do this?
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Solved in 2 steps
- The intensity of the light emitted by our sun peaks at about 550 nm. The frequency of this light is equal to 5.45x10^____. (Give the exponent.)*** 10. In very-long-baseline interferometry (VLBI) tracking of interplanetary spacecraft, a 8.4-GHz radio signal is sent from a spacecraft toward the earth. In order to determine the angular position of the spacecraft, the signal is received simultaneously at two Deep Space Network (DSN) stations and the phase of the received signal at each station is measured rela- tive to a stable clock. The distance between the antenna in Australia and the one in California is 10,588,966.336 m. To spacecraft 10,588,966.336 m Australia California a) What is the wavelength of the X-band radio signal? b) If the phase of the signal in the Australia antenna is found to be 10,458.6 cycles ahead of the signal in the California antenna, what must be the angle between the direction to the spacecraft and the normal to the baseline (the dashed line in the figure above)? [Check: The answer here is 0.002°.]The distance from earth to the nearest star is about 4 x 1016 meters. How long would it take a radio signal traveling at the speed of light, 3.0 x 108 m/s, to make a one-way trip to this star?
- Hello. this question is regarding the speed of light quick thought experiment: you have a rod that is 1 million kilometers across. if the rod can be moved slightly from either end, the other end will move as well. because this can serve as a signaling method to get small pieces of information across vast distances instantaneously, does it violate the speed of light?A light wave and sound wave travelling through air both have the same frequency (4000 Hz). Which wave has the bigger wavelength, or are they the same? Explain. (Sound waves travel through air at 340 m/s)Three children are riding on the edge of a merry-go-round that is a disk of mass 98 kg, radius 1.9 m, and is spinning at 25rpm. The children have masses of 24 kg, 26 kg, and 32.6 kg.Randomized VariablesM = 98 kgm1 = 24 kgm2 = 26 kgm3 = 32.6 kgr = 1.9 mf = 25 rpm If the child who has a mass of 26 kg moves to the center of the merry-go-round, what is the new magnitude of angular velocity in rpm? f' =
- Satellites around the Earth are often used to relay TV stations to different places. A mobile ground crew doing an interview beams the signal up to the satellite, which then echoes it back down to the TV ground station. This obviously means that the mobile crew has to be able to find the satellite in the sky, and this is much easier if the satellite is always at the same place in the sky. This is why the “geosynchronous orbit” is so useful- a satellite in a geosynchronous has an orbital period of 24 hours, so it goes around the Earth in the same time as the Earth rotates, and, from the point of view of the mobile ground crew, the satellite is always in the same place in the sky. How far from the Earth center is a geosynchronous orbit and how fast does a satellite have to be moving to stay in one?A star is 38 Million Miles from the Earth. How many meters is this? Express the answer in power of ten Example.