Mirrors
Lens
Mechanical Waves
Electromagnetic waves
100

MCQ: A sharp image is formed when light reflects from a(n) _____.

A) rough

B) smooth

C) absorbent

D) black

B) smooth

100

Complete:

 The human eye has two .............lenses.

convex

100

Complete:

Sound travels faster in.............. than in liquids.

Solid

100

MCQ:

A red ball reflects which of the following colors of light?

A) red

B) all colors but red

C) green

D) white

A) Red

200

Complete :
The reflection of light waves from a rough surface is.......... reflection.

diffuse

200

MCQ: Which would cause light to bend the most after traveling through air?
Solids

liquid

gas

Solid

200

MCQ:

Waves that need to travel through matter are known as

Medium waves

Mechanical waves

Air waves

Heat waves


Mechanical waves

200

Complete:

A material used to make paints that reflects some colors of light and absorbs others is called

a(n)...................

Translucent 

300

Give an example of a phenomenon that results in the scattering of light.

fog, clouds, dust in the air

300

Give an example of a device that uses a lens or lenses.

binoculars, eyeglasses, camera, magnifying glass

300

Complete :

A high point of a wave is known as a.................


Crest

300

there are 2 types of cells in the eye responsible for detecting different stimuli. clarify each and which stimulus they respond to?

Rod : detect shades

cone : colors

400

which Mirrors form virtual images?

Plane & convex

400

Your friend places a straw in a glass of water and is surprised to notice that the straw looks like it has broken at the surface of the water. Write an explanation to help your friend understand this phenomenon.

due to refraction. When light moves from one medium to another,

its speed changes. For example, when it moves from air to water, it slows down.

400

the distance between the first crest and the third crest is 20cm.calculate the wavelength

10cm

400

compare between Radio waves and X rays in 2 points

Radio waves : longest wavelength , lowest energy and frequency , used in communication

X-Rays: short wavelength , high frequency and energy , used in making images for teeth and bones 

500

compare between concave and convex mirrors in 3 points?

Concave mirror

- The curved surface is inward

- It converges (get together) the light rays

- it forms real images

Convex mirror

- The curved surface is outward

- It diverges ( spread)  the light rays

- it forms virtual images

500

Compare between convex and concave lens in 3 points

Concave :

Curve inward

Makes light diverge

Thicker at the edges than middle

Convex

Curve outward

Makes light converge

Thicker in the middle than edges

500
Which wave in the diagram has the greatest frequency? justify your answer?




4

short wavelength will lead to high frequency

500

Describe the path of the waves in each of the following:

1. the interactions of a light wave with a piece of cardboard

2. the interactions of a sound wave with a piece of cardboard

Light waves and sound waves will reflect off a piece of cardboard.

Light waves and sound waves will be absorbed by a piece of cardboard.

A sound wave will transmit through a piece of cardboard, but a light wave will not.

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