Q. No.The graph between the kinetic energy \((E_k)\) and the de-Broglie wavelength \((\lambda)\) of a moving electron is best represented by:
1.
2.
3.
4.
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| 1. | is directly proportional to \(f\) |
| 2. | is inversely proportional to \(f\) |
| 3. | is inversely proportional to \(\sqrt f\) |
| 4. | does not exist |
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| 1. | fastest photoelectron increases |
| 2. | slowest photoelectron decreases |
| 3. | fastest photoelectron decreases |
| 4. | slowest photoelectron increases |
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Work function of \(A\) is:
1. \(3.1~\text{eV}\)
2. \(2~\text{eV}\)
3. \(1~\text{eV}\)
4. \(1.5~\text{eV}\)
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Work function of \(B\) is:
1. \(3.1~\text{eV}\)
2. \(2~\text{eV}\)
3. \(1~\text{eV}\)
4. \(1.5~\text{eV}\)
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The fastest photoelectrons emitted, in all the experiments, have an energy of:
| 1. | \(3.1~\text{eV}\) | 2. | \(2.1~\text{eV}\) |
| 3. | \(1.1~\text{eV}\) | 4. | \(3~\text{eV}\) |
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(take \(hc=1240~\text{eV-nm}.\))
| 1. | will have a minimum energy of \(90~\text{eV}\) |
| 2. | will have a maximum energy of \(90~\text{eV}\) |
| 3. | will have a minimum energy of \(0.9~\text{eV}\) |
| 4. | will have a maximum energy of \(0.9~\text{eV}\) |
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| 1. | \(\lambda_A=\lambda_B\) only if \(m_A=m_B\) |
| 2. | \(\lambda_Am_A=\lambda_Bm_B\) |
| 3. | \(\Large\frac{\lambda_A}{m_A}=\frac{\lambda_B}{m_B}\) |
| 4. | \(\lambda_A=\lambda_B,\) independent of \(m_A\) or \(m_B\) |
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| 1. | will likely cause photoemission of electrons |
| 2. | will not cause photoemission of electrons |
| 3. | may or may not cause photoemission depending on the photon density |
| 4. | will cause photoemission only if its intensity is above a threshold |
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1. Potassium
2. Rubber
3. Plastic
4. Solid hydrogen
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