The most suitable instrument for measuring the size of an atom is.

Vernier calliper

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Optical Microscope

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Electron microscope

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Screw gauge

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Solution

The correct option is C
Electron microscope

Only electron microscope has resolution of 0.5-0.6 Angstrom which is less than the size of an atom.

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Which of the following is the most precise device for measuring length:

(a) a vernier callipers with 20 divisions on the sliding scale

(b) a screw gauge of pitch 1 mm and 100 divisions on the circular scale

= \frac{2.45}{50}

Microscope is an optical instrument which

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