When Light of Wavelength $350 \mathrm {~nm}$ Is Incident on a Metal Surface, the Stopping Potential of a Metal

question 179

Multiple Choice

When light of wavelength $350 \mathrm {~nm}$ is incident on a metal surface, the stopping potential of the photoelectrons is $0.500 \mathrm {~V}$ . What is the threshold (cutoff) frequency of this metal? $\left( c = 3.00 \times 10 ^ { 8 } \right.$ $\mathrm { m } / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } , 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J}$ )

• A) \(3.74 \times 10 ^ { 14 } \mathrm {~Hz}\)
• B) \(7.36 \times 10 ^ { 14 } \mathrm {~Hz}\)
• C) \(3.47 \times 10 ^ { 14 } \mathrm {~Hz}\)
• D) \(4.73 \times 10 ^ { 14 } \mathrm {~Hz}\)

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