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.

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

talk back to him about the sport and show him your expertise or leave the room

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.