Each Photon in a Beam of Light Has an Energy $4.20 \mathrm { eV }$

question 160

Multiple Choice

Each photon in a beam of light has an energy of $4.20 \mathrm { eV }$ . What is the wavelength of this light? $( c =$ $3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } , 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J}$ )

• A) \(296 \mathrm {~nm}\)
• B) \(420 \mathrm {~nm}\)
• C) \(103 \mathrm {~nm}\)
• D) \(412 \mathrm {~nm}\)
• E) \(321 \mathrm {~nm}\)

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