Question

Visible light travels at a speed 3.0 × 108 of m/s. if red light has a wavelength of 6.5 × 10–7 m, what the frequency of this light?

Answer 1

w.k.t

c= v × wavelength

v= c÷ wavelent
$3 \times 10 {}^{8} \div 6.5 \times 10 {}^{ - 7} \\ 0.461 \times 10 {}^{15}$
hope it helps

Answer 2

4800000000000000approx.