Which sequence shows electromagnetic waves arranged in a decreasing order of their wavelengths
a. visible light, gamma rays, infrared rays, x-rays, ultraviolet rays
b. infrared rays, visible light, ultraviolet rays, x-rays, gamma rays
c. gamma rays, x-rays, ultraviolet rays, visible light, infrared rays
d. ultraviolet rays, visible light, gamma rays, x-rays, infrared rays

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

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