The wave length range of the visible spectrum extends from violet (400 nm)to red ( 750 nm). Express these wavelengthsin frequencies ( Hz) ` ( 1 nm =10^(-9) m)`.

Explanation

To express the wavelengths of the visible spectrum (400 nm for violet and 750 nm for red) in terms of frequency (Hz), we will use the formula that relates wavelength (λ), frequency (ν), and the speed of light (c):

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

Where:
- \( \nu \) = frequency (in Hz)
- \( c \) = speed of light in vacuum (approximately \( 3 \times 10^8 \) m/s)
- \( \lambda \) = wavelength (in meters)
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