Which type of electromagnetic wave travels through space the slowest? 14. A all

Question

Which type of electromagnetic wave travels through space the slowest? 14. A all EM waves travel at the same speed. B Microwaves C Radio waves D Ultraviolet light E Infrazed light As your are looking through two polartizers at a lightbulb, it appears as bright as possible, After turning one of the polartners by 180 degrees, the lightbulb would appear A equally bright B as dark as possible C darker, but not as dark as it could be if you turned the polarism differently Two polarizds are placed in an unpolarized beam of light with an anlge theta = 34 degree between thier axes. What percent of the incident light makes it through? A 0.0 B. 28.4 C. 34.4 D. 43.3 E. 55.0 F 65.2 G 87.5 H 100.0 A rear view mirror on a car has the words "object is mirror are tower than they appear Written on it. Which king of mirror is it? A. Convex mirror B. Concave mirror C. Plane mirror D. Cannot tell

Explanation / Answer

1. Em travels with speed c in space.

Ans. all em travels at the same speed.

2. cos180 = 1^2

I = I0 (cos@)^2

hence equally bright,

(A)

3. for unpolarized light,

I = I0/2   = 0.5I0

now If = I (cos@)^2 = 0.5 I0 (cos34)^2 = 0.344 I0

ans . (C) 34.4%

4. mirror use in car are concave mirror.

5. for i = iC ( critical angle)

r = 90 deg

using snell's law,

ni sini = nr sinr

1.42 siniC = 1.21 sin90

sinIc = 0.852

Ic = 58.44 deg

Ans(C)

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