Work function or threshold frequency from the kinetic energies at two wavelengths or frequencies

1. A.
   $\frac{2hc}{\lambda}$
2. B.
   $\frac{hc}{\lambda}$
3. C.
   $\frac{2hc}{3\lambda}$
4. D.
   $\frac{hc}{3\lambda}$

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1. A.
   $\frac{E_2\lambda_2 - E_1\lambda_1}{\lambda_2 - \lambda_1}$
2. B.
   $\frac{E_1\lambda_1 + E_2\lambda_2}{\lambda_2 - \lambda_1}$
3. C.
   $\frac{E_1\lambda_1 - E_2\lambda_2}{\lambda_2 - \lambda_1}$
4. D.
   $\frac{E_2\lambda_2 + E_1\lambda_1}{\lambda_1 - \lambda_2}$

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1. A.
   $\frac{hc}{\lambda}$
2. B.
   $\frac{hc}{2\lambda}$
3. C.
   $\frac{hc}{3\lambda}$
4. D.
   $\frac{3hc}{\lambda}$

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1. A.
   $\frac{U_1-U_2}{x}$
2. B.
   $\frac{v_1-v_2}{x-1}$
3. C.
   $\frac{xv_1-v_2}{x-1}$
4. D.
   $\frac{xv_2-v_1}{x}$

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1. A.
   $\frac{3hc}{\lambda}$
2. B.
   $\frac{hc}{3\lambda}$
3. C.
   $\frac{hc}{\lambda}$
4. D.
   $\frac{hc}{2\lambda}$

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1. A.
   3.5 eV
2. B.
   1.1 eV
3. C.
   0.48 eV
4. D.
   0.22 eV

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1. A.
   $\frac{kv_{2} - v_{1}}{k - 1}$
2. B.
   $\frac{v_{2} - v_{1}}{k}$
3. C.
   $\frac{v_{1} - v_{2}}{k - 1}$
4. D.
   $\frac{kv_{1} - v_{2}}{k - 1}$

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1. A.
   $\frac{hc}{2\lambda_{1}\lambda_{2}}\left( \lambda_{1} - \lambda_{2} \right)$
2. B.
   $\phi_{0} = \frac{hc}{3}\left\lbrack \frac{4}{\lambda_{2}} - \frac{1}{\lambda_{1}} \right\rbrack$
3. C.
   $\frac{hc}{\lambda_{1}\lambda_{2}}\left( \lambda_{1} + \lambda_{2} \right)$
4. D.
   $\frac{hc}{3\lambda_{1}\lambda_{2}}\left( 4\lambda_{2} - \lambda_{1} \right)$

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1. A.
   $\dfrac{v_1 - v_2}{k}$
2. B.
   $\dfrac{v_1 - v_2}{k - 1}$
3. C.
   $\dfrac{kv_1 - v_2}{k - 1}$
4. D.
   $\dfrac{kv_2 - v_1}{k - 1}$

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1. A.
   $\dfrac{K\nu_1 - \nu_2}{K - 1}$
2. B.
   $\dfrac{K - 1}{K\nu_1 - \nu_2}$
3. C.
   $\dfrac{K - 3}{K\nu_1 - 3\nu_2}$
4. D.
   $\dfrac{K\nu_1 - 3\nu_2}{K - 3}$

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1. A.
   $\dfrac{3hc}{\lambda}$
2. B.
   $\dfrac{hc}{3\lambda}$
3. C.
   $\dfrac{hc}{2\lambda}$
4. D.
   $\dfrac{hc}{\lambda}$

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