Atomic Spectra
4 free MDCAT Physics MCQs on Atomic Spectra (PM&DC syllabus), each with the answer, an explanation and the textbook line it comes from. Tap to check, no sign-up.
Tap an answer to check it · 4 questions
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Question 1
To obtain an absorption line spectrum, the element's cool vapour is placed between the narrow slit and a:Show answer and explanation
Answer: A) White light source
Its atoms absorb particular wavelengths from the white light. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 137.
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Question 2
Characteristic X-rays come from heavy atoms because their inner-shell electrons are:Show answer and explanation
Answer: B) Tightly bound
A large energy is needed to knock them out. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 204.
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Question 3
In an X-ray tube, most of the kinetic energy of the electrons striking the target is converted into:Show answer and explanation
Answer: C) Heat
Only a small part becomes X-rays, so the target needs a high melting point. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 206.
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Question 4
Continuous X-rays have a range of wavelengths because most electrons striking the target:Show answer and explanation
Answer: D) Are not stopped in one collision
Only an electron stopped in a single collision gives the minimum wavelength hc/eV. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 205.
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