Which statement is true about the speed of waves in the electromagnetic spectrum?

a) the speed of all electromagnetic wave is inversely proportional to their wavelength.
b) the speed of all electromagnetic waves is directly proportional to their frequency.
c) in a vacuum, all electromagnetic waves travel at speeds between 1.098 x10^5 and 2.998 x 10^8 m/s.
d) in a vacuum, all electromagnetic waves travel at the peed of 2.998 x 10^8 m/s.

An charge with mass m and charge q is emitted from the origin, (x, y)=(0,0). a large, flat screen is located at x=l. there is a target on the screen at y position y(h), where y(h) > 0. in this problem, you will examine two different ways that the charge might hit the target. ignore gravity in this problem. 1.assume that the charge is emitted with velocity v(0) in the positive x direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive y direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l. 2.now assume that the charge is emitted with velocity v(0) in the positive y direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive x direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l.