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Q. No.Which of the following is not the property of cathode rays:
| 1. | it produces a heating effect. |
| 2. | it does not deflect in the electric field. |
| 3. | it casts a shadow. |
| 4. | it produces fluorescence. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biologydemonstrated that:
| 1. | cathode rays are streams of negatively charged ions. |
| 2. | all the mass of an atom is essentially in the nucleus. |
| 3. | the \(\frac{e}{m}\) of electrons is much greater than the \(\frac{e}{m}\) of protons. |
| 4. | the \(\frac{e}{m}\) ratio of the cathode ray particles changes when a different gas is placed in the discharge tube. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. \(10^{20}\)
2. \(10^{25}\)
3. \(10^{30}\)
4. \(10^{40}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA photo-cell is illuminated by a source of light, which is placed at a distance \(d\) from the cell. If the distance becomes \(\dfrac{d}{2}\), then the number of electrons emitted per second will be:
1. same
2. four times
3. two times
4. one-fourth
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | work function of material |
| 2. | intensity of incident radiation |
| 3. | frequency of incident radiation |
| 4. | wavelength of incident radiation |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe wavelength of light in the visible region is about \(550\) nm (average wavelength) for yellow-green colour. Three materials with work functions are given as Al (\(4.28\) eV), Cu (\(4.65\) eV) and Na (\(2.75\) eV). From which of these photosensitive materials, can you build a photoelectric device that operates with visible light?
1. Al
2. Cu
3. Na
4. none of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. \(2\) V
2. \(3.2\) V
3. \(4.2\) V
4. \(5.2\) V
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. \(\frac{\lambda{P}}{h c} f\)
2. \(\frac{2\lambda{P}}{h c} f\)
3. \(\frac{\lambda{P}}{h c} f e\)
4. \(\frac{2\lambda{P}}{h c} f e\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | \(V_0 /2\) | 2. | \(V_0 \) |
| 3. | \(4V_0 \) | 4. | \(2V_0 \) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAccording to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect Chapter Topics:
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