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FINAL REVISION SHEET FOR GRADE 7 – SECOND TERM FINAL EXAM

MATERIAL FOR THE FINAL EXAM :

CHAPTER 22

1- Section 1: nature of light . (403-406)

2- Section 2: electromagnetic spectrum(407-414) .

3- Section 3 : interaction of lihgt waves (415-422)

The final revision sheet will be givin by teacher for all students

CHOOSE THE CORRECT ANSWER :

1. WHAT ARE ELECTROMAGNETIC WAVES?

a. sound waves

b. electricity

c. changing gravitational fields

d. changing electric and magnetic fields

2. The moon is384,000 kilometers from Earth. How long does light take to travel that distance? Hint: the speed of light is 300,000 km/s.

a. 1.28 seconds

b. 12.8 seconds

c. 0.78 seconds

d. 7.8 seconds

3. Where does Earth get its major source of energy from?

a. food

b. fossil fuels

c. photosynthesis

d. EM waves from the sun

4. Electromagnetic waves transmit

a. charges. c. matter.

b. fields. d. energy.

5. You can see yourself in a mirror because of

a. absorption. c. regular reflection.

b. scattering. d. diffuse reflection.

6. Shadows have blurry edges because of

a. diffraction. c. diffuse reflection.

b. scattering. d. refraction.

d. white

MATCHING

READ THE DESCRIPTION. THEN, DRAW A LINE FROM THE DOT NEXT TO EACH DESCRIPTION TO THE MATCHING WORD.

|1. light waves bouncing off an object |• | a. absorption |

|2. waves bending as they pass at an angle from one |• |b. reflection |

|material to another |• |c. diffraction |

|3. waves bending around barriers or through openings |• |d. refraction |

|4. transfer of light energy to particles of matter | | |

| 5. two or more waves combining to make one wave with |• | a. scattering |

|more height |• |b. constructive interference |

|6. two or more waves combining to make one wave with |• |c. destructive interference |

|less height |• |d. incidence |

|7. interaction of light with matter that causes light to| | |

|change direction | | |

|8. arrival of a beam of light at a surface | | |

FILL-IN-THE-BLANK

READ THE WORDS IN THE BOX. READ THE SENTENCES. FILL IN EACH BLANK WITH THE WORD OR PHRASE THAT BEST COMPLETES THE SENTENCE.

|gamma rays |infrared waves |

|ultraviolet light |visible light |

1. An EM wave that can cause sunburn is ______________________.

2. Light you can see is called ______________________.

3. EM waves that can be used to treat cancer are called______________________.

4. EM waves that make whatever they strike feel warmer are ______________________.

|radio waves |microwave |

|X rays |radiation |

5. EM waves used by cellular phones are______________________.

6. EM waves used to broadcast television signals are______________________.

7. EM waves used to see inside suitcases without opening them are______________________.

8. The transfer of energy as EM waves is _____________________

|GAMMA RAY | |

|X- RAY | |

|ULTRA VIOLET | | |

|VISIBLE LIGHT | |

|INFRA RED | |

|MICROWAVE | |

|RADIO WAVE | |

| | |

FILL UP THE FOLLOWING TABLES :

Complete the table shows the light interaction :

|interference | | |

|diffraction | |

|refraction | |

|absorption and scattering| | |

|reflection | | |

| | | |

Don’t forget to write the properties for each inter action and draw if possible

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Increasment of wave length

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