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Grade 8 Light and Optics- Section 3.0 Light is part of the Electromagnetic Spectrum

Last updated 17 days ago

9 questions

Note from the author:

Audio support has been added

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Question 1

1.

What model is used to describe and explain the properties of light? (page 213)

Question 2

2.

If someone said that violet light has a higher frequency than red light, what do they mean? Are they correct? (page 215)

Question 3

3.

The electromagnetic spectrum ranges from low-energy to high-energy waves. Explain how wavelength is related to the energy of electromagnetic radiation. (page 217)

Question 4

4.

Answer the following questions:
a) Where does infrared radiation appear on the electromagnetic spectrum? (page 217)
b) Can you detect infrared radiation with your body? If so, how?
c) What is the importance of infrared radiation to you?

Question 5

5.

Electromagnetic radiation is used in engineering. Technicians will direct radiation at thick concrete or steel to detect tiny cracks. What type of radiation (infrared, radio, gamma, etcetera.) would best suit the task? Explain. (See pages 217 and 220 of your textbook for more information to help you answer this question)

Question 6

6.

Explain how fluorescent lights work. (There is more information on this on page 222 of your textbook).

Question 7

7.

Explain how a firefly produces light. Why is this light called cool light? (more information can be found on page 225 of your textbook).

Question 8

8.

Using the theory of color addition, how would you produce cyan-colored light? (see page 227 of your textbook for more information)

Question 9

9.

Scientists have often used models to help explain their observations. What models have been introduced to help explain the nature of light? We have discussed two of them, and you may need to refer to your notes or Section 3 of the textbook.