Sound and Light SC.7.P.10.2-3

Which of these statements is a correct explanation of how objects absorb and reflect colors of light?

• Black objects absorb all wavelengths of light.

• White objects both absorb and reflect almost all wavelengths of light.

• Red objects absorb red light and reflect all other wavelengths of light.

• Blue objects absorb none of the wavelengths of light and reflect only blue light.

Suppose a mechanical wave such as sound is traveling through medium A, when the wave enters medium B, it speeds up. Which of the following statements can be true about medium A and B?

• Medium A is a Solid and Medium B is a Gas

• Medium A is a Liquid and Medium B is a Solid

• Medium A is a Gas and Medium B is a Vacuum

• Medium A is a Vacuum and Medium B is a Liquid

The image shows light entering water. Which statement explains why light bends as it enters the water?

• Light bends because water absorbs some of the light that reaches it.

• Light bends because the water reflects some of the light that reaches it.

• Light bends because water changes the amount of energy the light carries.

• Light bends because water changes the speed of light when it moves from air into water.

Jacob went down to the lake on a very still day. The water's surface was completely smooth and he could see a tree reflected perfectly in the water. A breeze came up and disturbed the surface of the water and the reflection of the tree disappeared. Why could he see the tree's reflection when the water was still, but not when it was disturbed?

• The disturbed surface made the light waves reflect in many directions, breaking up the image.

• The disturbed surface allowed some of the light waves to penetrate into the water, making gaps in the image.

• The disturbed surface kept the light waves from reflecting, making it impossible to see an image.

• The disturbed surface changed the light waves' wavelengths, changing the reflected image.

Light can be reflected, refracted, or absorbed. Which of these statements best describes the refraction of light?

• Light waves strike an object and bounce off.

• Light waves bend and spread around an object in their path.

• Light waves change speed as they pass through different materials.

• Light waves cause an increase in the motion of particles within an object.

Andrea held her hand up in front of a light and a shadow in the shape of her hand appeared on the opposite wall. What property of light explains why the shadow appeared?

• Light travels in a straight line.

• Light passes through all objects.

• Light bends around solid objects.

   

• Light partially passes through solid objects.

We see color as a result of reflection. What color does an object have to be to reflect the most light?

• black

• blue

• green

• white

Waves change speed as they enter media of different densities. In which of these situations would light slow down?

• From Glass to Air

• From Ice to Water

• From Plastic to Air

• From Vacuum to Air

An apple appears red. Which of the colors of light listed below must be absorbed for objects to appear red?

• red only

• red and black

• red and white

• green, yellow, and blue

Tags

NGSS.MS-PS4-2

A wave travels through different materials at different speeds. Which sound waves would travel at the fastest speed?

• sound waves generated by fireworks that explode in the sky

• sound waves generated by an earthquake that shake the ground

• sound waves generated by a bat finding its way through echolocation

• sound waves generated by whales communicating with each other in the ocean