What order of frequency is suitable for observing a particle of radius 3 × 10⁻⁴ cm using electromagnetic radiation?
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What order of frequency is suitable for observing a particle of radius 3 × 10⁻⁴ cm using electromagnetic radiation?

G1 Physics · Accepted Answer

Step 1: To resolve a particle, probe radiation should have wavelength comparable to its diameter/radius scale. Step 2: Given r = 3 × 10⁻⁴ cm = 3 × 10⁻⁶ m, take λ ~ r. Step 3: Frequency f ~ c/λ ≈ (3 × 10⁸)/(3 × 10⁻⁶) = 1 × 10¹⁴ Hz. Correct choice C (not the previous misread B). Final answer: (C) 10¹⁴Hz.