Man's physical universe

xanabras

LIGHT IS A FORM OF RADIANT ENERGY 397

growth of living things, particularly seeds or primary cells; for example,

onions treated with two-meter waves bloom ten days before nonexposed

plants.

Ultrashort radio waves transmit energy more efficiently than do

longer radio waves.

STUDY QUESTIONS

1. Upon what evidence did Young base his conclusions concerning the nature of

light?

2. How do light quanta differ from one another?

3. List the most important types of electromagnetic waves.

4. State two fundamental properties of wave motion.

5. Outline briefly the two light theories. What is their status today?

6. How should the speculations and theories of scientists be treated by the

average individual?

7. Discuss the value of infrared photography.

8. Discuss the physiological effects of ultraviolet rays.

9. Compare the different electromagnetic rays as to their ability to penetrate

matter and their physiological effect.

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