题目内容

X-rays are most effectively stopped by ______.

A. Copper
B. Glass
C. Lead
D. Tungsten

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When the energy from an x-ray tube has penetrated through 3 half-value layers, only 3/4 of the original energy remains.

A. True
B. False

The "photoelectric" effect involves complete absorption of the photon.

A. True
B. False

After Compton scattering, the scattered x-ray has_______.

A. Higher energy
B. Higher velocity
C. Less mass
D. Longer wavelength

The intensity of an x-ray beam passing through a patient______.

A. increases linearly
B. decreases linearly
C. decreases quadratically
D. decreases exponentially