X-rays are defined as:
Correct answer: B. Electromagnetic radiations of very high frequency
- A. Electromagnetic radiations of high mass number
- B. Electromagnetic radiations of very high frequency
- C. Electromagnetic radiations of high wavelength
- D. Electromagnetic radiations of low energy
Explanation
X-rays are electromagnetic radiations of extremely short wavelengths and high frequency, which is why option B is correct.Option C is wrong because X-rays have short wavelengths.Option D is incorrect because X-rays have higher energies.Option A is wrong because X-ray photons have no mass or charge.
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About Quantum Theory and Radiation
Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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