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BITSAT 2010
Exam
BITSAT
Year
2010
Subject
Physics
Chapter
Dual Nature of Matter

BITSAT 2010 · Physics · Dual Nature of Matter

The photoelectric threshold of metal is 2000 . The energy of the...

The photoelectric threshold of metal is 2000A˚2000 \AA. The energy of the electrons ejected from the surface by ultraviolet light of wavelength 1500A˚1500 \AA is

Options

  1. A2.0eV2.0 \mathrm{eV}
  2. B1.5eV1.5 \mathrm{eV}
  3. C15eV15 \mathrm{eV}
  4. D150eV150 \mathrm{eV}

Correct answer

A. 2.0eV2.0 \mathrm{eV}

Step-by-step solution

Ek=hce(1λ−1λ0)=2.0eV\mathrm{E}_{\mathrm{k}}=\frac{\mathrm{hc}}{\mathrm{e}}\left(\frac{1}{\lambda}-\frac{1}{\lambda_{0}}\right)=2.0 \mathrm{eV}
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