(a) What is the frequency of violet colourof wavelength `4000 A^@` ?
(b) What is the frequency of red colour of wavelength `8000 A^@` ?

Explanation

To solve the question, we will use the formula that relates the speed of light (C), wavelength (λ), and frequency (ν):

\[ \nu = \frac{C}{\lambda} \]

Where:
- \( \nu \) is the frequency,
- \( C \) is the speed of light (approximately \( 3 \times 10^8 \) m/s),
- \( \lambda \) is the wavelength in meters.
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