Yellow light has a wavelength of 600 nm. If it is in air, what is the frequency?

Question

Yellow light has a wavelength of 600 nm. If it is in air, what is the frequency?

A) 500 x 1012 m

B) 500 x 1012 Hz

C) 2.0 x 10-15 Hz

D) 500,000 Hz

2. If a wave has a wavelength of 3000 nm which is the same as 3 microns (3 um), what part of the electromagnetic spectrum does it belong to?

A) Radio waves

B) Microwaves

C) Infrared

D) Ultraviolet

E) Visible

3. Radio waves travel through empty space

A) Faster than visible light

B) Slower than visible light

C) At the same speed as visible light

D) With only electric fields and not magnetic fields

4. If an electric field wave oscillates north and south, and the wave is traveling straight up, then what direction does the magnetic field wave oscillate?

A) East and west

B) North and south

C) Up and down

D) It does not oscillate: this situation is impossible.

5. An engineer at the company you are working for has just reported finding an unusual electromagnetic wave. This wave consists only of an electric field, with no magnetic field accompanying it. You are certain that the engineer is mistaken because

A) an electromagnetic wave must have a magnetic field that changes with time to produce its electric field.

B) electromagnetic waves always contain both electric charges and magnetic poles, and magnetic poles are accompanied by magnetic fields.

C) electromagnetic waves contain moving electric charges and charges produce magnetic fields when they move.

D) while waves consisting only of electric fields are common and travels indefinitely through space, they are known as "electric waves," not "electromagnetic waves." PHY 1050 Fall 2012 HW #4

6. Microwaves have wavelengths between

A) 1 micron to 100 microns.

B) 1 millimeter to 1 meter.

C) 1 micrometer to 1 millimeter.

D) 1 meter to 1000 meters.

7. Microwaves have

A) shorter wavelengths than visible light

B) comparable wavelengths to visible light

C) longer wavelengths than visible light

D) no wavelength at all

8. If you put an egg in a microwave oven, it will become very hot. But if you put a dehydrated egg (a dried egg containing no water) in the microwave oven, the egg will not be affected because

A) the dehydrated egg is too dry to have a temperature. Only foods containing water or oil can actually become hot.

B) the dehydrated egg reflects the microwaves while the normal egg does not.

C) microwaves transfer heat to food principally through its water molecules.

D) the dehydrated egg is much less dense than a normal egg and doesn't conduct heat well.

9. Microwaves have

A) lower frequencies than visible light

B) comparable frequencies to visible light

C) higher frequencies than visible light

D) no frequency at all

10. An x-ray travelling in the vacuum of space has a frequency of 1x1018 Hz. What is the wavelength?

A) 3.33 x 109 meters

B) 3.33 x10-9 meters

C) 3.00 x10-10 meters

D) 3.44 x10-16 meters

Explanation / Answer

1.b 2.c 3.b 4.a 5.d 6.b 7.c 8.c 9.a 10.c

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