In 1959, the water stored behind Hegben Lake Dam in Montana began to slosh violently back and forth in a series of oscillating waves. These seiches were caused by .

It is increased due to the doppler effect. (apex)

We can infer that star y is closer but other factors must be considered include the heat of the star, the mass, and the brightness of the star. even though star x seems dimmer it may just be less bright or contains less heat.

Mm: distances smaller than centimeters  km: for very large distanceshope this can i get brainliest