Asinusoidal wave traveling in the negative x direction (to the left) has an amplitude of 20.5 cm, a wavelength of 28.5 cm, and a frequency of 15.0 hz. the transverse position of an element of the medium at t = 0, x = 0 is y = −3.00 cm, and the element has a positive velocity here. we wish to find an expression for the wave function describing this wave.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.