7/30/2019 Study Guide for Ch 9 Waves and LightKey

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Name ________________________________________________________ pd _____

Study Guide for Ch.9 Waves and LightVocabulary you need to know! Fill in the blanks

1 Electromagneticwaves

A disturbance that involves the transfer of electric and magneticenergy.

2 Electromagnetic

radiation

The energy that electromagnetic waves transfer through matter or

space.

3 Reflection Occurs when parallel rays of light hit a smooth surface.

4 Image A copy of the object formed by reflected or refracted rays of light.5 Optical axis An imaginary line that divides a mirror in half, much like the

equator that divides Earth into northern and southern halves.

6 Wave length The distance between the crest of one wave and the crest ofanother wave.

7 Frequency The number of waves that pass a given point in a certain amountof time.

8 Focal point Forms when light rays actually meet.

9 Index of refraction A measure of how much a light ray bends when it enters that

medium.

10 Concave lens A lens that is thinner in the middle than at the ends.

11 Electromagnetic

spectrum

The complete range of electromagnetic waves placed in order by

increasing frequency.

12 Radio Waves Electromagnetic waves with the longest wavelengths and the

shortest frequencies.

13 Diffuse reflection Occurs when parallel rays of light hit an uneven surface.

14 Plane Mirror A flat sheet of glass that has a smooth, silver colored coating onone side.

15 Focal point The point at which rays parallel to the optical axis reflect andmeet.

16 Microwaves Electromagnetic waves with shorter wavelengths and higherfrequencies than radio waves.

17 Infrared rays Electromagnetic waves that have shorter wavelengths and higher

frequencies than microwaves.

18 Convex Mirror A mirror with a surface that curves outward.

19 Mirage An image of a distant object caused by refraction of light.

20 Convex lens A lens that is thicker in the center than at the edges.

21 Visual light Electromagnetic waves that you can see.

22 Ultraviolet rays Electromagnetic waves with wavelengths shorter than visible light but

longer than x-rays.

23 Virtual Image An image that forms where light seems to come from.

24 Concave Mirror A mirror with a surface that curves inward like the inside of a bowl.

25 X- rays Electromagnetic waves with wavelengths shorter than ultraviolet rays.

26 Gamma rays Electromagnetic waves with the shortest wavelengths and the highestfrequencies.

27 ray A straight line that represents light waves.

28 lens A curved piece of glass or other transparent material that refracts light.

Short Answers:

7/30/2019 Study Guide for Ch 9 Waves and LightKey

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Name ________________________________________________________ pd _____

1. Electromagnetic waves are disturbances between electric and magnetic energy.

2. Electromagnetic waves do not require a medium to transfer energy.

3. Waves travel at the speed of light.

4. The suns energy arrives on Earth as electromagnetic radiation.

5. A plane mirror produces a reverse right left and virtual image.

6. A convex mirror curves outward and a concave mirror curves inward.

7. Concave mirrors produce virtual and real images.

8. The bending of light waves as they enter a new medium is called Index of refraction.9. A mirage is an image of a distant object caused by refraction.

10. A curved piece of glass that is used to refract light is called a (n) lens.

Identify each part of the wave below by writing the name of each part that is numbered.

1. Crest2. Wave high

3. Baseline

4. Trough

5. Wavelength6. Trough

Use the diagram below to answer the following questions:

1. Which of the waves above has the longest wavelength? Radio waves2. Which of the waves above has the shortest wavelength? Gamma waves3. Which of the waves has the greatest energy? Gamma waves4. Which of the waves would be most harmful to humans? Gamma waves5. Which part of the spectrum above can humans see? Visible light6. Which of the waves above has the lowest frequency? Radio waves7. Which of the waves above has the highest frequency? Gama Waves

1.

2.

5.

4. 6.

3.

7/30/2019 Study Guide for Ch 9 Waves and LightKey

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Name ________________________________________________________ pd _____

Use the diagram to answer the following questions.

Name letter C and E.C=optical axis

E= focal pointWhat type of mirror is shown?Concave Mirror

What kind of image is formed?Real Image

What would happen to the image if the object wasplaced between E and D?

A virtual image.

Answer the following questions with complete sentences.

1. Explain what happens to light as it passes through air, water, and glass.

As light passes through air, water and glass it is refracted.

2. Explain the difference between regular and diffuse reflection.

In regular reflection light is reflected off a smooth surface and the image is clear. In diffuse reflection light isreflected off an uneven surface and the image is not clear.

3. How are all electromagnetic waves alike and different from each other?

All electromagnetic waves carry energy and move in straight paths, one wave carries electric energy and theother carries magnetic energy crating the electromagnetic waves, they can travel in space and do not need a

medium to travel.

All electromagnetic waves are arranged based on frequency in the electromagnetic spectrum. Starting with thelowest frequency, least energy and largest wavelength. These are radio waves. The last wave has the highesfrequency, highest energy, and shortest wave length, and is called gamma rays. These waves are veryharmful to humans.