Flashcards on X-rays: questions for medical school entrance exams
X-rays: Questions for Medical School Entrance Exams Guide
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Rentgenové záření v medicíně
27 cards
Card 1
Question: What are the approximate wavelengths of X-rays?
Answer: X-rays have wavelengths ranging from approximately 0.01 to 10 nanometers.
Card 2
Question: What are the approximate frequencies of X-rays?
Answer: X-rays have frequencies ranging from 3 × 10¹⁶ to 3 × 10¹⁹ Hz.
Card 3
Question: How does the energy of X-rays compare to ultraviolet light and gamma rays?
Answer: X-rays are higher in energy than ultraviolet light but lower than gamma rays.
Card 4
Question: Why are X-rays valuable in medical diagnostics and therapy?
Answer: Their ability to penetrate soft tissues and be absorbed by denser materials makes them invaluable in medical diagnostics and therapy.
Card 5
Question: How are X-rays produced?
Answer: X-rays are produced when high-speed electrons are suddenly decelerated or when they interact with the inner-shell electrons of atoms.
Card 6
Question: Where does X-ray production primarily occur?
Answer: X-ray production primarily occurs within an X-ray tube.
Card 7
Question: What is an X-ray tube?
Answer: An X-ray tube is an evacuated glass envelope containing a cathode and an anode.
Card 8
Question: What is the cathode typically made of in an X-ray tube and what is its function?
Answer: The cathode is typically a heated filament (made of tungsten) that emits electrons via thermionic emission.
Card 9
Question: What accelerates electrons towards the anode in an X-ray tube?
Answer: A high voltage (potential difference) applied between the cathode and the anode accelerates electrons towards the anode.
Card 10
Question: What is the anode typically made of in an X-ray tube and what is its role?
Answer: The anode, usually made of tungsten or a tungsten-rhenium alloy, is the target where X-rays are produced.