题目内容

German physicist, Wilhelm Roentgen, discovered the X-ray in 1895. What was the first human body part he tried to image?

A. Head
B. Hand
Chest
D. Foot

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Thermionic emission is electrons being boiled off and creates something called ____.

A. Space emissions
B. Static charge
C. Space charge
D. X-ray

Each of the following is a part of the cathode assembly except ____.

A. Filament
B. Stator
C. Focusing Cup
D. Associated Wiring

Filament materials are chosen for their______.①High Melting Point ②Low Melting Point ③Ability to Vaporize Easily ④High Atomic Number

A. Numbers 1 & 3 only
B. Numbers 2 & 3 only
C. Numbers 1 & 4 only
D. Numbers 2 & 4 only

The cathode is a filament composed of

A. Tungsten
B. Lead
Copper
D. Aluminum