Question

what is formula for wavelength of the light

Answer 1

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Formula: c = f where: c = the speed of light = 300,000 km/s or 3.0 x 108 m/s. = the wavelength of light, usually measured in meters or Ångströms (1 Å = 10-10 m) f = the frequency at which light waves pass by, measured in units of per seconds (1/s).
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Answer 2

Formula of wavelength of light,

Wavelength= speed of light/frequency

= C/v

C= 3× 10^ 8m/s