Sound of frequency 372.7 hz propagates in phase from two loudspeakers; the speed of sound in air is 343.5 m/s. the first loudspeaker is at the origin, and the second is at 8.8m·(j is the unit vector in the y-direction) a person starts on the x-axis at a very long distance from the loudspeakers and walks directly towards the loudspeaker at the origin. how far is the person from the origin the second time they encounter a loud sound (constructive interference)?

ill do it for 100, also this isnt 80 its 40

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.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.