Answers to Selected Problems - West Valley College
Answers to Selected Problems - West Valley College
Answers to Selected Problems - West Valley College
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Problem Sets Physics 4D<br />
In a pho<strong>to</strong>electric experiment it is found that a s<strong>to</strong>pping potential of 1.00 V is needed <strong>to</strong> s<strong>to</strong>p all the<br />
electrons when incident light of wavelength 260 nm is used and 2.30 V is needed for light of wavelength<br />
207 nm. From these data determine Planck’s constant and the work function of the metal.<br />
Answer(s)<br />
h = 4.40 x 10 -15 eV∙s ; φ = 4.1 eV<br />
Melvin J. Vaughn Page 44 of 61 <strong>West</strong> <strong>Valley</strong> <strong>College</strong>
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