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

Explanation

To convert the wavelengths of violet (400 nm) and red (750 nm) light into frequencies (Hz), we will follow these steps:

### Step 1: Convert wavelengths from nanometers to meters
Given:
- \( \lambda_{violet} = 400 \, \text{nm} \)
- \( \lambda_{red} = 750 \, \text{nm} \)

Using the conversion \( 1 \, \text{nm} = 10^{-9} \, \text{m} \):
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