Let there be LIGHT-7th

In which of the following will light travel the fastest?

• vacuum

• air

• water

• glass

Why can you see most objects?

• light reflects off them

• light refracts off them

• they emit light

• they absorb light

Tags

NGSS.MS-PS4-2

The image below shows the electromagnetic spectrum. Which type of electromagnetic wave is the most damaging to human cells?

• X-rays

• gamma rays

• radio waves

• microwaves

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NGSS.HS-PS4-4

What is the main difference between the types of electromagnetic waves?

• shape of the waves

• frequency of the waves

• amplitude of the waves

• speed that the waves travel in a vacuum

The image below shows the electromagnetic spectrum. Which type of electromagnetic wave has a high enough frequency that it penetrates softer materials such as muscle or clothing but is absorbed by hard and dense materials such as bone? It also appears light colored when photographed.

• X-rays

• gamma rays

• radio waves

• microwaves

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NGSS.MS-PS4-1

NGSS.MS-PS4-2

What can you summarize about the wavelength of ultraviolet light from the information in the image?

• UV-a radiation has the shortest wavelength, and UV-c has the longest wavelength.

• UV-a radiation has the longest wavelength, and UV-c has the shortest wavelength.

• UV-a and UV-b radiation have the same wavelength, and UV-c has the shortest wavelength.

• UV-a, UV-b, and UV-c have the same wavelength because they are types of ultraviolet rays.

Which statement about light rays reflecting off a plane mirror is TRUE?

• The angle of incidence equals the angle of reflection.

• The sum of the angle of incidence and angle of reflection is 90°.

• An incident and reflected rays are parallel.

• Both the angle of incidence and the angle of reflection are measured from the mirror.

Tags

NGSS.MS-PS4-2

What term describes the interaction of light with dust particles in the air?

• absorption

• refraction

• scattering

• transmission

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NGSS.MS-PS4-2

A lifeguard on the pool deck is observing a person standing in the water. To the lifeguard, the feet of the person in the pool appear to be shallower than they actually are. Which interaction of light is responsible for this observation?

• transmission

• absorption

• reflection

• refraction

Tags

NGSS.MS-PS4-2

The image below shows a light ray passing from air into blocks of four different transparent materials. Which best explains these observations?

• Light changes speed as it enters a different material.

• Light slows the most in material I.

• Light slows the most in material IV.

• The speed of light is the same in all four materials.

Tags

NGSS.MS-PS4-2