What will be the wavenumber of yellow radiation having wavelength 240 nm?

Question

What will be the wavenumber of yellow radiation having wavelength 240 nm? (A) 1.724 × 104 cm-1 (B) 4.16 × 106 cm-1 (C) 4 × 1014 Hz (D) 219.3 × 103 cm-1

Tardigrade Admin · Accepted Answer

Wavelength of yellow light = 240 nm = 240 × 10-9 m Wavenumber ( bar upsilon)=(1/λ) =(1/240 × 10-9 m) =4.16 × 106 m-1

Q. What will be the wavenumber of yellow radiation having wavelength $240 nm$ ?

$1.724 \times 1 0^{4} c m^{- 1}$

$4.16 \times 1 0^{6} c m^{- 1}$

$4 \times 1 0^{14} Hz$

$219.3 \times 1 0^{3} c m^{- 1}$

Wavelength of yellow light $= 240 nm$
$= 240 \times 1 0^{- 9} m$
Wavenumber $(\overset{υ}{ˉ}) = \frac{1}{λ}$
$= \frac{1}{240 \times 1 0 ^{- 9} m}$
$= 4.16 \times 1 0^{6} m^{- 1}$

Q. What will be the wavenumber of yellow radiation having wavelength 240nm?

1.724×104cm−1

4.16×106cm−1

4×1014Hz

219.3×103cm−1