1. A wave traveling on a string is described by the equation: y (x, t) = (15.0 cm) cos (pi x - 15t) (With x in meters an

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1. A wave traveling on a string is described by the equation: y
(x, t) = (15.0 cm) cos (pi x - 15t)
(With x in meters and t in seconds) \ Find the (i) amplitude, (ii)
frequency, (iii) wavelength, (iv) period, (v) angular
frequency
(vi) angular wave number and (vii) speed of the wave.
2. The speed of light is exactly c = 299 297 458 m/s.
(a) How long does it take for light to travel in a straight line
from San Diego to
Los Angeles? (a distance of 179 km)
(b) How far will light travel in 3.00 ns?
(c) A light year is the distance travelled by light in one Julian
year (365.25 days).
Calculate it in meters.