Question

the meter was defined in 1963 as the length equal to 1,650,763.73 wavelengths of the orange red radiation emitted by the krypton-86 atom (the meter has since been redefined). What is the wavelength of this transition? What is the frequency?

Answer 1

1m = 1,650,763.73 × wavelength(λ)

$\lambda$ = 1/1,650,763.73

$\lambda$ = 6.058 × $10^{-7}$m

c = $\lambda$f

f = c/$\lambda$

f = 3×10⁸/6.058× 10^-7

f = 4.95 × 10¹⁴ Hz