In an electron microscope, we use energetic particles because of______________?
Correct answer: C. Wavelength is very short
- A. Penetrating power is high
- B. Kinetic energy is large
- C. Wavelength is very short
- D. All the above reasons
Explanation
Energetic electrons have high momentum, and their de Broglie wavelength is λ = h/p, so increasing momentum makes the wavelength very short. A shorter wavelength permits much greater resolving power and reveals smaller details. Penetrating power and kinetic energy may also increase, but the reason for improved microscopic resolution is the short wavelength.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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