[ha12]

ابي اجابات للاسئله هذي ومشكورين



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1- All of the following are electromagnetic waves, except ________ .
(a) Heat. (b) Radiation used in magnetic imaging(MRI).
(c) Sunlight. (d) Sound. (e) FM radio signals.

2- If the wavelength of an x-ray is reduced to half, its energy is ________ .
(a) Increased by 4 . (b) Increased by 2 . (c) Unchanged.
(d) Decreased to 0.5 . (e) Decreased by 0.25 .

3- If the wavelength of an x-ray is reduced to half, its speed is ________ .
(a) Increased by 4 . (b) Increased by 2 . (c) Unchanged.
(d) Decreased to 0.5 . (e) Decreased by 0.25 .

4- If the wavelength of an x-ray is reduced by half, its frequency is ________ .
(a) Increased by 4 . (b) Increased by 2 . (c) Unchanged.
(d) Decreased to 0.5 . (e) Decreased by 0.25 .

5- The x-ray that penetrate best through patient tissue have the smallest ________ .
(a) Frequency. (b) Energy. (c) Speed. (d) Wavelength. (e) Quanta.

6- The wavelength of a 60-Kav x-ray is about ________ .
(a) 4.5 microns. (b) 0.2 angstroms. (c) 0.001 mm .
(d) 1.25 × 10‐⁸ cm . (e) 6.3 MB.

7- As the energy of x-rays is increased, the x-rays have ________ .
(a) Faster speed. (b) Lower frequency. (c) Shorter wavelength.
(d) Longer wavelength. (e) The same speed, wavelength, and frequency.

8- For equal image quality, radiographs have lower radiation doses if the x-rays have _______ .
(a) Higher frequency. (b) Longer wavelengths. (c) Faster speed.
(d) More quanta. (e) Longer period.

9- All of the following are transverse waves, except ________.
(a) Gamma rays. (b) Ultraviolet. Waves. (c) Microwaves. (d) X-rays
(e) Diathermy waves.

10- To make certain that the x-rays have dissipated after clinical radiography, one should wait at least ________ before entering the room.
(a) 50 nanoseconds. (b) 50 microseconds. (c) 50 femtoseconds.
(d) 50 milliseconds. (e) 50 deciseconds[/align]