Threshold frequency from the ratio of maximum kinetic energies at two frequencies

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.
   $\frac{kv_{2} - v_{1}}{k - 1}$
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.
   $\dfrac{v_1 - v_2}{k}$
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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