When Sodium yellow light (λ = 5890 A0 ) is used in double-slit experiment, the first-order...
When Sodium yellow light (λ = 5890 A0 ) is used in double-slit experiment, the first-order maximum is observed at a distance of 0.05cm from the central maximum. When the light is placed by one of an unknown wavelength, the third-order maximum occurs at 0.065 cm. what is the wavelength of this later light?
Homework Answers
For n-th order maximum,
dy/D = nλ
For first order maximum of sodium light,
d * 0.05 / D = 1 * 5890
For third order maximum of unknown light,
d * 0.065 / D = 3λ
So,
3λ / 5890 = 0.065 / 0.05
=> λ = (0.065 / 0.05) * 5890 / 3 = 2552.3 Ao
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