Threshold wavelength or work function from photoelectric readings at two wavelengths

1. A.
   $\frac{2\lambda}{3}$
2. B.
   $\frac{4\lambda}{5}$
3. C.
   $\frac{\lambda}{3}$
4. D.
   $\frac{5\lambda}{2}$

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1. A.
   $7750\text{ }nm$
2. B.
   $775\text{ }nm$
3. C.
   $77.5\text{ }nm$
4. D.
   can't be determined

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1. A.
   $1.537eV$
2. B.
   $2.46eV$
3. C.
   $0.615eV$
4. D.
   $1.23eV$

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

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1. A.
   $5\lambda$
2. B.
   $3\lambda$
3. C.
   $9\lambda$
4. D.
   $4.5\lambda$

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1. A.
   $2.9 \times 10^{- 8}$
2. B.
   $2.2 \times 10^{- 8}$
3. C.
   $3.1 \times 10^{- 7}$
4. D.
   $2.5 \times 10^{- 7}$

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1. A.
   1
2. B.
   4
3. C.
   2
4. D.
   3

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1. A.
   $K_{2} + 2{\text{ }K}_{1}$
2. B.
   $2{\text{ }K}_{2} - K_{1}$
3. C.
   $K_{1} - 2{\text{ }K}_{2}$
4. D.
   $K_{2} - 2{\text{ }K}_{1}$

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