The ligo experiment, which historically detected gravitational waves for the first time in september 2015, uses a pair of highly sensitive michelson interferometers. these have arms that are 4.00 km long and use powerful nd: yag lasers with 1064 nm wavelength. the beams traverse the arms both ways 280 times before recombining, which effectively lengthens the arm length to 1120 km. the devices are tuned so that the beams destructively interfere when they recombine if no gravitational wave is present. (a) the beam has a power of 100 kw, concentrated into an area of a square centimeter. calculate the amplitude of the electric field in the beam. (b) ligo can detect a gravitational wave that temporarily lengthens one arm by the minuscule amount of 10-18 m! when this happens, the beams combine with a phase difference of a +8. estimate the shift 8 in radians. note that the phase difference accumulates during both traversals of each round trip. (c) use eq. (35.7)0 to estimate the sensitivity of the photodetector in terms of the minimal electric field strength needed to detect a gravitational wave.
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Physics, 22.06.2019 00:20
In the derivation of rrkm theory, a factor of 1/2 is introduced when equalizing the rates of formation and decomposition of activated complex as keal-hr) = ko this is clearly against the assumption of transition state theory that states all the activated complex in the transition state iss going to the product. find the reason why this factor is introduced here.
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Physics, 22.06.2019 19:30
Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, βfβ =maβ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: aβ 1=βgj^.
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Physics, 22.06.2019 20:00
What is the name of the perceived change in a sound waveβs frequency due to motion between the observer and the sound source?
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Physics, 22.06.2019 21:30
In the illustration, which two simple machines are being used to enable the student to reach the door? a. inclined plane and pulley b lever and wheel-and-axle c pulley and lever d wheel-and axle and inclined plane
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The ligo experiment, which historically detected gravitational waves for the first time in september...
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