Question

lambda= 4000Adegrees find frequency and wave number​

Answer 1

Answer:

wavenumber = 1/wavelength

or, wave number

= 1/4000×10^-10

= 0.00025×10^10

= 2.5× 10^6

now frequency = c/ lambda

or, frequency= 3× 10^8/4000×10^-10

= 0.00075 × 10^18

= 7.5 × 10^-4 × 10^18

= 7.5 × 10^14 m