Per NCERT Problem 2.5, the WAVENUMBER ν̄ of EM radiation is defined as which quantity?
AThe same as frequency
Bλ × c
CFrequency × wavelength
DThe reciprocal of wavelength (1/λ) — number of waves per unit length, commonly cm⁻¹
Answer & Solution
Correct answer: D. The reciprocal of wavelength (1/λ) — number of waves per unit length, commonly cm⁻¹
Per NCERT §2.3.1 + Problem 2.5, ν̄ = 1/λ. SI unit m⁻¹; spectroscopy commonly uses cm⁻¹.
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