A particle A moves along the line = 30 with a constant velocity ( = 3.0 /) directed parallel to the positive axis (see figure). A
second particle B starts at the origin with zero speed and constant
acceleration ( = 0.40 /2) at the same instant the particle A passes
the axis. What angle between and the positive axis would result in
a collision between these two particles?

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

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like poles repel so keep pushing north to north and repels funny to see this

double the distance = divide strength by 4