an oscillator with a frequency of 0.25 hz is set in motion. one second later, an identical oscillator is set in motion. what is the phase separation of these two oscillators. show your work !

x1 = A sin ω t = A sin (2 pi f t)     equation for SHM with no phase

x1 =A sin (2 * pi * .25 t)  = A sin (.5 * pi * t)

x2 = A sin (.5  pi * (t - 1)) = A sin (.5 pi  t - pi/2)  second oscillator lags by 1 sec

So x2 is pi / 2 behind x1 in phase

Or x2 = A cos .5 pi t    since sin (Ф - pi/2) = cos Ф

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.