How many orders will be visible if the wavelength of the incident radi

1.	How many orders will be visible if the wavelength of the incident radiation is 5000 Å and the number of lines on the grating is 101319 per metre.
Answer» Correct Answer - 19 Given : d = \(\cfrac1{101319}\) λ = 5000 x 10^-10 m λ = 5 x 10^-7 m using d sin θ = nλ θ = 90° d = nλ n = \(\cfrac{d}λ\) = \(\cfrac1{5\times10^{-7}}\) x \(\cfrac1{101319}\) n = \(\cfrac{10000000}{506595}\) = 19.73

How many orders will be visible if the wavelength of the incident radiation is 5000 Å and the number of lines on the grating is 101319 per metre.

Answer» Correct Answer - 19

Given :

d = \(\cfrac1{101319}\)

λ = 5000 x 10^-10 m

λ = 5 x 10^-7 m

using d sin θ = nλ

θ = 90°

d = nλ

n = \(\cfrac{d}λ\) = \(\cfrac1{5\times10^{-7}}\) x \(\cfrac1{101319}\)

n = \(\cfrac{10000000}{506595}\) = 19.73

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How many orders will be visible if the wavelength of the incident radiation is 5000 Å and the number of lines on the grating is 101319 per metre.

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