An electromagnetic wave contains: a) electric fields only, b) magnetic fields on

Question

An electromagnetic wave contains: a) electric fields only, b) magnetic fields only, c) electric and magnetic fields, d) magnetic and gravitational fields, e) electric and gravitational fields.______ When one listen in California to a "live" radio program from New York, the radio waves travel at the speed of a) light, b) 400 miles/hour, c) sound, d) 100 miles/hour.______ Given that the index of refraction of diamond is 2.4, what is the speed of light in diamond? ____ Which pigment absorbs all of the light incident on it, "white" or "black"? ________ From the following list, pick the waves which are not electromagnetic waves: a) radio, b) sound c) light, d) microwaves. _____ A red light has a wavelength of 740 nm (nm = nanometers = 10^-9 meters). What is the frequency of this red light? _______ Beams of red light and blue light are sent through a prism (a triangular piece of glass). The index of refraction of red light is 1.509, and the index of refraction of blue light is 1.517. Which beam, the red or the blue, is bent the most (has the greatest change of direction)? ______ The sky looks blue because it is a reflection of the oceans which are blue. (True/False) _______ Sunsets look red, orange, or yellow because the observer is seeing light which is: a) not scattered and goes relatively straight, b) scattered c) reflected, d) refracted and bent through a large No matter what the material it is traveling through, light always travels at the speed, c = 3.0 times 10^8 m/s. (True/False) _________ @@@mion finf^r0r^ne1, C "ave coo, *''* a) electric fields only, b) magnet* fields only. C) electric aloo I as c yew*. d) magnetic and gravitational fields o) decency and gravitational fields I, 2 ', V*"" 000 Helens m California to a -live" Rao program from New York. the radio waves ' travel at the speed of a) bight. b) 400 miles/hour, c) sound, d) 100 metre/hour 3.) Given that the index of refraction of diamond is 2 4. what rs the speed of Wight in diamond? 4.) Which pigment absorbs all of the light McLeod on it. "white" or "black"? 5.) From the following fast pick the waves which are no electromagnetic waves a) radio, b) sound. C) light. d) microwaves - 6) A red light has a wavelength of 740 nm (nm- nanometers middot 10'metefs) What

Explanation / Answer

(1) Option (c) Electric and magnetic field, is the correct answer.

Electromagnetic field means electric and magnetic combined.

(2) Option (a) Light, is the correct answer.

Speed of radio wave is equal to the speed of light.

(3) Speed of light in sound = (3.0x10^8) / 2.4 = 1.25 x 10^8 m/s

(4) Black is the correct answer.

Black pigment absorbs all colour.

(5) Option (b) Sound is the correct answer.

Sound wave is not a electromagnetic wave.

(6) Frequency, f = c / lemda = (3.0 x 10^8) / (740 x 10^-9) = 4.054 x 10^14 Hz.

(7) Red light has greatest change of direction (lower refractive index).

(8) False. Blue colour of sky is due to scattering of light.

(9) Option (d) Refracted and bent through a large angle, is the correct answer.

(10) Flase. Speed of light depends on the refractive index of the material.

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