Wavelength Formula:
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Definition: This calculator determines the wavelength of light corresponding to the energy absorbed in a photochemical reaction.
Purpose: It helps chemists and physicists understand the relationship between energy and wavelength in photochemical processes.
The calculator uses the formula:
Where:
Explanation: The formula calculates the wavelength of light that corresponds to the energy absorbed per mole of substance in a photochemical reaction.
Details: Knowing the wavelength helps determine what type of light will be effective for a photochemical reaction and provides insight into the energy requirements of the process.
Tips: Enter the energy absorbed in the photochemical reaction in Joules. The energy must be > 0.
Q1: Why do we use Avogadro's number in this calculation?
A: Because we're calculating for one mole of substance undergoing the photochemical reaction.
Q2: What are typical energy values for photochemical reactions?
A: Most photochemical reactions involve energies between 100-500 kJ/mol (100,000-500,000 J/mol).
Q3: What wavelength range does this typically correspond to?
A: For visible light, wavelengths range from about 400-700 nm (4×10⁻⁷ to 7×10⁻⁷ m).
Q4: How does wavelength relate to reaction energy?
A: Shorter wavelengths correspond to higher energy photons, which can drive more energetic reactions.
Q5: Can this be used for single molecules rather than moles?
A: Yes, but you would need to omit Avogadro's number from the calculation.