Question 6The frequency of violet light is 7.5 x 1014 Hz. Its wavelength in nm is :7500 nm4000 nm400 nm750 nm

Question

Accepted Answer

400 nmReason — As we know,Speed of light (c) = Frequency (f) x Wavelength (λ)andC = 3 x 108 m s-1Frequency range = 7.5 × 1014 HzSubstituting the values in the formula,3×108=7.5×1014×λλ=3×1087.5×1014⇒λ=0.4×10−6m⇒λ=400×10−9m3 \times 10^8 = 7.5 × 10^{14} \times λ \[0.5em] \text {λ} = \dfrac {3 \times 10^8 }{7.5 × 10^{14}} \[0.5em] \Rightarrow \text {λ} = 0.4 \times 10^{-6} \text {m} \[0.5em] \Rightarrow \text {λ} = 400 \times 10^{-9} \text {m} \[0.5em]3×108=7.5×1014×λλ=7.5×10143×108​⇒λ=0.4×10−6m⇒λ=400×10−9mTherefore,λ = 400 nm

Spectrum — Question 6

Question 6