Man's physical universe




found that diffraction actually took place. This experiment permitted

the measurement of the wave length of X rays and thus established the

nature of X rays. It also proved to be a valuable tool for the study of

the structure of crystals.


1. Under what conditions will the air conduct electricity?

2. How may the air become ionized?

3. How many volts would be required to produce an electric discharge through

ten feet of air?

4. What are the important properties of X rays that cause them to be so useful?

5. What is the nature of X rays?

6. What enables a spark to pass between the terminals of an induction coil?

7. How may the ionizing power of a given ionizing agent be determined?

8. Why is it that neon tubes conduct the electrical current through such long

distances at relatively low voltages?

9. Describe the properties of cathode rays, and show how these properties were


10. How are X rays produced?

11. List the applications of X rays.

12. Give the principle of the fluoroscope.

13. How was it shown that X rays are electromagnetic waves?

14. Give a theory to explain the aurora.

15. How has it been made possible to take miniature X-ray photographs?

16. What evidence is there that cathode rays consist of a stream of electrons?


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