The frequency of a light wave in a material is 2 × 1014 Hz and wavelength is 5000 A. The refractive index of material will be (a) 1.50 (b) 3.00 (c) 1.33 (d) 1.40

Answer: (b). Speed in the material: v = νλ = (2×10¹⁴)(5000×10⁻¹⁰) = 1×10⁸ m/s. Refractive index n = c/v = 3×10⁸1×10⁸ = 3. So the answer is (b) 3.00.

The frequency of a light wave in a material is 2 × 1014 Hz and… | NEET 2007 (AIPMT)

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Wave Theory, Wavefronts & Doppler Effect

The frequency of a light wave in a material is 2 $\times$ 1014 Hz and wavelength is 5000 $\mathring{A}$ . The refractive index of material will be

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Answer: (b)

Speed in the material: $v = \nu\lambda = (2\times10^{14})(5000\times10^{-10}) = 1\times10^{8}$ m/s.
Refractive index $n = c/v = \dfrac{3\times10^{8}}{1\times10^{8}} = 3$ .
So the answer is (b) 3.00.