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To calculate the frequency of light, it's essential first to convert the wavelength into meters. This is because standard equations in physics involving speed and light use meters as the unit of distance. In the exercise, the wavelength is given as \(4.257 \times 10^{-7} \text{ cm}\). We need to convert it into meters. Remember that 1 centimeter equals 0.01 meters. Therefore, you multiply the given wavelength by 0.01:

The speed of light is a constant value that is used in many equations in physics. The standard value used is approximately \(3 \times 10^8 \text{ m/s}\). This speed is denoted by the symbol \( c \). The relationship between the speed of light, its frequency (\( u \)), and its wavelength (\( \text{wavelength} \)) is given by the following equation:
due to this, equations involving speed and light typically use meters as the unit of distance.
\[ c = u \times \text{wavelength} \]

• \( c \) is the speed of light (\(3 \times 10^8 \text{ m/s}\))
• \( u \) is the frequency
• \(\text{wavelength}\) is the final converted wavelength in meters

After converting the wavelength into meters and knowing the speed of light, we can solve for the frequency of light using the formula:
\[ u = \frac{c}{\text{wavelength}} \]
By substituting the known values:
\[ u = \frac{3 \times 10^8 \text{ m/s}}{4.257 \times 10^{-9} \text{ m}} \]
Performing this division will yield the frequency:
\[ u \approx 7.048 \times 10^{16} \text{ Hz} \]
Hence, the frequency of light with a wavelength of \(4.257 \times 10^{-7} \text{ cm}\) is approximately \(7.048 \times 10^{16} \text{ Hz}\).
This calculation demonstrates how understanding the fundamental concepts of wavelength conversion, the speed of light formula, and frequency calculation can easily guide you to find the frequency of any given light.