Electromagnetic Waves, Reflection, Refraction

Light entering a new medium at an angle will change direction because it changes ___.

• frequency

• polarization

• amplitude

• speed

• energy

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NGSS.HS-PS4-1

Select all that are TRUE about Reflection & Refraction.

• Refraction is when light strikes & bounces off an object

• Reflection is when light strikes & bounces off an object

• Reflection is when light bends as it passes through a substance

• Refraction is when light bends as it passes through a substance

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NGSS.MS-PS4-2

A ray of light in oil (n = 1.75) is angled at 25° to the normal when it encounters a layer of water, where it makes an angle of 33.8° to the normal in the water. The index of refraction of water is ___.

• 1.29

• 1.33

• 0.739

• 0.760

• 1.00

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NGSS.HS-PS4-5

Order these radiant energy forms from least energy to most energy

• microwave

• infrared

• visible

• radio

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NGSS.HS-PS4-4

A student placed a pencil in a cup of water.  The pencil appears broken because light-

• always travels in a straight line
• bends when it passes through water
• makes the water in the glass evaporate
• reflects the pencil on the water's surface

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NGSS.HS-PS4-1

In a vacuum/empty space, the speed of light...

• can vary

• is always 3.0×10⁸ m/s

• is slower than the speed of light through a medium

• is less than the speed of sound in a vacuum

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NGSS.HS-PS4-1

Two polarizing filters are set up so the transmitted light is at a maximum intensity.

Through which angle should polariser 2 be rotated so that no light is transmitted?

• 45º

• 60º

• 90º

• 180º

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NGSS.HS-PS4-5

NGSS.HS-PS4-3

Solve this problems using the equation:

c = λ·f

If an AM radio station broadcasts at

9.95 x 10⁵ Hz, what is the wavelength of this radiation?

• 6.59 x 10^-28 m

• 1.01 x 10^-6 m

• 3.32 x 10^-3 m

• 302 m

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NGSS.HS-PS4-1

What is the angle of incidence?

• The angle at which light bends in water.

• The angle at which light arrives at a surface.

• The angle at which light is absorbed by an object.

• The angle at which light bounces off a surface.

If light moves at 1.24×10⁸ m/s in diamond, the index of refraction of diamond is ___.

• 2.42

• 1.24

• 0.413

• 55

• 3.72×10¹⁶

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NGSS.HS-PS4-1