Answer
a)Given,
Wavelength of blue light = 450 n m = 450 x 10⁻⁹ m
Speed of light = 3 x 10⁸ m/s
we know,
[tex]c = \nu \lambda[/tex]
[tex]\nu = \dfrac{c}{\lambda}[/tex]
[tex]\nu = \dfrac{3\times 10^8}{450\times 10^{-9}}[/tex]
[tex]\nu = 6.67 \times 10^{14}\ Hz[/tex]
b)Given,
Wavelength of red light = 650 n m = 650 x 10⁻⁹ m
Speed of light = 3 x 10⁸ m/s
we know,
[tex]c = \nu \lambda[/tex]
[tex]\nu = \dfrac{c}{\lambda}[/tex]
[tex]\nu = \dfrac{3\times 10^8}{650\times 10^{-9}}[/tex]
[tex]\nu = 4.62 \times 10^{14}\ Hz[/tex]
