FA 5 (Light Energy)

1. How does light travel?

• does not travel

• by reflecting through space until it is transmitted

• travels by refracting through space until it is absorbed

• in a straight line until it hits an object

Answer explanation

Light travels in a straight line. Please check your textbook on page 140. You can also demonstrate how light travels using 3 pieces of cardboard (with holes in the middle of each cardboard).

Tags

NGSS.MS-PS4-2

2. If you wanted a gift to be a surprise, what kind of container would you put it in?

• transparent

• thick

• opaque

• translucent

Answer explanation

Opaque materials DO NOT transmit light at all. They ABSORB the light that strikes them. Read your CN 5. 🙂

3. Which of the following set of materials allow all/most light to pass through?

• cement wall, long table, thick bag

• eyeglasses, clear glass, window glass

• wax paper, frosted glass, lampshade

• clear vase, colored paper, pile of books

Answer explanation

Eyeglasses, clear glass, and window glass are mostly made of a TRANSPARENT material.

When light encounters TRANSPARENT materials, almost all of it passes directly through them.

Tags

NGSS.MS-PS4-2

4. An image is seen on a shiny surface when light is __________.

• transmitted

• reflected

• refracted

• absorbed

Answer explanation

Review CN 7. REFLECTION occurs when light BOUNCES OFF a smooth surface. 🙂

Tags

NGSS.MS-PS4-2

5. Which of the following materials would reflect the most light?

• a flat sheet of aluminum foil

• a piece of red construction paper

• a bumpy, black rock

• a dark brown carpet square

Answer explanation

Aluminum foil is OPAQUE since no light can pass through it.

NO light can pass through the foil because it REFLECTS the light rays.

Tags

NGSS.MS-PS4-2

6. What is most likely to happen to light that hits an opaque object?

• All of the light passes through the object.

• Some of the light passes through the object.

• Most of the light disappears.

• None of the light passes through the object.

Answer explanation

OPAQUE objects BLOCK light from traveling through them. Review CN 5.

Tags

NGSS.MS-PS4-2

7. What happens when a light strikes a transparent surface, such as window glass or plastic wrap?

• Light can be absorbed and heated.

• Light will reflect and scatter.

• Light can be transmitted.

• The light will be refracted.

Answer explanation

Note that light may be transmitted when the object allows it to pass through. Depending on how much light may pass through, a material may be classified as opaque, translucent, or transparent.

TRANSPARENT materials TRANSMIT ALL or MOST light that strike it. Check your handwritten CN 5.🙂

Tags

NGSS.MS-PS4-2

8. Which of these best explains why a student can see her reflection in a computer screen when the screen is turned off?

• Computers produce light when they are being used.

• The glass allows light to be transmitted through it.

• Smooth, shiny objects reflect a great amount of light.

• Black objects absorb most of the light striking them.

Answer explanation

Yay! SMOOTH surfaces are GOOD REFLECTORS. They can reflect almost all the light that falls on them. 🙂

Tags

NGSS.MS-PS4-2

9.) Light is __________ when it is able to pass through materials.

• blocked

• energized

• reflected

• transmitted

Answer explanation

Light is a form of energy that travels in a straight line. It may be transmitted when the object allows it to pass through. 

Tags

NGSS.MS-PS4-2

10.) Which material will you use if you want to keep your room lit by the sun but not too bright?

• thick, dark curtain

• transparent plastic

• wooden window slat

• frosted glass window

Answer explanation

You can use thick, dark curtain if you want to keep your room lit by the sun but not too bright.

Tags

NGSS.MS-PS4-2