A Monochromatic Light Beam Is Incident on the Surface of a Metal

question 161

Multiple Choice

A monochromatic light beam is incident on the surface of a metal having a work function of $2.50$ $\mathrm { eV }$ . If a $1.0 - \mathrm { V }$ stopping potential is required to make the electron current zero, what is the wavelength of light? $\left( c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } , 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} \right)$

• A) \(423 \mathrm {~nm}\)
• B) \(744 \mathrm {~nm}\)
• C) \(355 \mathrm {~nm}\)
• D) \(497 \mathrm {~nm}\)

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