Question

calculate the wave no. and frequency whose wave length is 5800 A°.

Answer 1

Frequency=c/wavelength =3×10^8/5800×10^-10 =5.1×10^14 mWavelength should be converted into meter Here wavelength is given in angstrom therfore it should be converted into meter.1m=10^-10Angstrom

Answer 2

Wave number = 1/Wavelength = 1/(5800 Å)
= 1724137.93 m^-1

Frequency = c/Wavelength
= (3×10^8)/(5800)
= 5.168×10^14 Hz