Visible spectrum extends from 400 nm (violet) to 750 nm (red). Hence frequency ratio is

Question

Visible spectrum extends from 400 nm (violet) to 750 nm (red). Hence frequency ratio is (A) 4 / 15 (B) 8 / 15 (C) 15 / 8 (D) none of these

Tardigrade Admin · Accepted Answer

v1=(c/λ1)=(c/400 nm ) ; v2=(c/λ2)=(c/750 nm ) (v1/v2)=(c/400) × (750/c)=(15/8)

Q. Visible spectrum extends from $400 nm$ (violet) to $750 nm$ (red). Hence frequency ratio is