(Electromagnetic spectrum/ waves ch 26-28) Physics

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What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km?

1 Hz

If the speed of light in a medium is 1.5×10^8 m/s, the medium's index of refraction is

2.0

A lunar eclipse occurs when the

Moon passes into Earth's shadow

Which of these electromagnetic waves has the shortest wavelength?

X-rays

At the same time an astronaut on the moon sees a solar eclipse, observers on Earth see

a lunar eclipse

Light travels fastest in

a vacuum

Materials generally become warmer when light is

absorbed by them

The greenish blue of water is evidence for the

absorption of red light

Amongst the following media, a beam of light travels fastest in

air

Atoms can be excited by

all of these

Interference is a property of

all of these

A single raindrop illuminated by sunshine disperses

all the colors of the rainbow

What color light is transmitted by a piece of blue glass?

blue

Rainbows exist because light is

both of these

What do electrons have that protons always have in equal magnitude?

charge

A sheet of red paper will look black when illuminated with

cyan light

Object and image for a plane mirror lie

equal distances from the mirror

If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes

for light to travel from the sun to the earth

Different colors of light correspond to different light

frequencies

The energy of a photon depends on its

frequency

A mixture of cyan and yellow pigments appears

green

When a light beam emerges from water into air, the average light speed

increases

Most of the waves in the electromagnetic spectrum are

invisible to humans

Color depends on what characteristic of light

its frequency

Compared to its average speed in air, the average speed of a beam of light in glass is

less

Compared to ultraviolet waves, the wavelength of infrared waves is

longer

Light is emitted when an electron

makes a transition to a lower energy level

The main difference between a radio wave and a sound wave is their different

modes of travel

What is the wavelength of an electromagnetic wave that has a frequency of 1 hertz?

more than 1 m

A red crab very deep in water, where sunlight is dim, appears

no color - black

Electromagnetic waves consist of

oscillating electric and magnetic fields

When ultraviolet light is incident upon glass, atoms in the glass

resonate

Which of the following is fundamentally different from the others

sound waves

Refraction results from differences in light's

speed

Different colors are dispersed by a prism because different colors in the prism have different

speeds

Astronomers can tell whether a star is approaching or receding from Earth by

the Doppler effect

Compared to radio waves, the velocity of visible light waves in a vacuum is

the same

Consider light energy that is momentarily absorbed in glass and then re- emitted. Compared to the absorbed light, the frequency of the re-emitted light is

the same

Light will almost always travel from one place to another along a path of least

time

Light refracts when traveling from air into glass because light

travels slower in glass than in air

Sunburns are produced by

ultraviolet light

The highest frequency light of those below is

violet

Which color of light carries the most energy per photon?

violet

Your image in a plane mirror is

virtual

The complementary color of blue is

yellow

The brightest color emitted by the sun is

yellow-green


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