# Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculate the frequency (ν) and wave number (v¯) of the yellow light. - Chemistry

Numerical

Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculate the frequency (ν) and wave number (bar v) of the yellow light.

#### Solution

From the expression,

lambda = "c"/"v"

We get,

"v" = "c"/lambda  ....(i)

Where,

ν = frequency of yellow light

c = velocity of light in vacuum = 3 × 108 m/s

λ = wavelength of yellow light = 580 nm = 580 × 10–9 m

Substituting the values in expression (i):

"v" =(3xx10^8)/(580xx10^(-9)) = 5.17 xx 10^14 "s"^(-1)

Thus, frequency of yellow light emitted from the sodium lamp

= 5.17 × 1014 s–1

Wave number of yellow light, barv = 1/lambda

= 1/(580xx10^(-9)) = 1.72 xx 10^6  "m"^(-1)

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Chapter 2: Structure of Atom - EXERCISES [Page 69]

#### APPEARS IN

NCERT Chemistry Part 1 and 2 Class 11
Chapter 2 Structure of Atom
EXERCISES | Q 2.5 | Page 69

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