Question

calculate the frequency and wave number of radiation of having wave lenght 560nm

Answer 1

frequency = c/ lemda

$f = 3 \times 10 {}^{8} \div 56 \times {10}^{ - 8} = 168 {s}^{ - 1}$

$wave \: number \: = 1 \div 56 \times {10}^{ - 8 } \\ = {10}^{8} \div 56 = 0.0178 \times {10}^{8} \\ = 178 \times {10}^{4}$