Atom with higher atomic number produces X-rays of__________________?
Correct answer: A. Shorter wavelength
- A. Shorter wavelength
- B. Larger wavelength
- C. X-ray not produced
- D. All are possible
Explanation
According to Moseley's relationship, increasing atomic number increases the frequency of characteristic X-rays. Since wavelength and frequency are related by c = wavelength x frequency, a higher frequency means a shorter wavelength. Students may choose b by assuming that a heavier atom emits lower-energy radiation, but higher atomic number gives higher-frequency X-rays.
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About Planck's Quantum Theory
Planck's quantum theory states that energy is emitted or absorbed in discrete packets called quanta, with each packet having energy E = hν. It covers the meaning of Planck's constant, the relationship between frequency and wavelength, and how quantisation differs from the classical continuous model of energy.
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