A photon has energy 3 eV. Convert this energy to joules.

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Multiple Choice

A photon has energy 3 eV. Convert this energy to joules.

Explanation:
Convert the energy from electronvolts to joules using the conversion 1 eV = 1.602×10^-19 J. For 3 eV, E = 3 × 1.602×10^-19 J = 4.806×10^-19 J. This is the precise value; rounding gives 4.8×10^-19 J. The value 1.6×10^-19 J is just 1 eV, and 3.0×10^-19 J would be missing the proper conversion factor, so they don’t match the given energy.

Convert the energy from electronvolts to joules using the conversion 1 eV = 1.602×10^-19 J. For 3 eV, E = 3 × 1.602×10^-19 J = 4.806×10^-19 J. This is the precise value; rounding gives 4.8×10^-19 J. The value 1.6×10^-19 J is just 1 eV, and 3.0×10^-19 J would be missing the proper conversion factor, so they don’t match the given energy.

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