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[Long Answer Questions/Numericals-5 Marks Questions]
1. The total electrical energy of an electron in the first excited state of hydrogen atom is about - 3.4e V. What is the K.E. of the electron in this case ?
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2. State laws of photoelectric emission and explain these on the basis of Einstein’s photoelectric equation.
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3. Show that de-Broglie wavelength A of electrons of energy E is given by the relation λ = h/√2mE .
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4. Calculate the radius of the smallest orbit of a H-atom.
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5. Calculate the de Broglie wavelength of an electron accelerated through a potential difference of 60 V.
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6. Draw a graph to show the variation of Stopping potential with the frequency of the incident radiation on a metal plate. How can the value of Planck’s constant be determined from this graph ?
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7. State the laws of photoelectric emission and explain these on thebasis of Einstein’s photoelectric equation.
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Related CBSE Information
[Short/Very Short Answer Questions-1, 2 Marks]
1. Name the series of hydrogen spectrum lying in ultraviolet region.
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2. The total energy of an electron in the first excited state of the hydrogen atom is about —3.4eV. What is the P.E. of the electron in this state ?
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3. What is Bohr's quantisation condition for angular momentum of an electron in the second orbit ?
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4. What is a-particle ? In the reaction zXA = a + Y, give the atomic number and mass number ofY.
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5. What is beta decay ? Give one
Very Short Answer Type Question
Q. 1. What are cathode rays 7
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Q. 2. Are cathode rays a part of electromagnetic rays ?
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Q. 3. What is the charge and mass of an electron ?
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Q. 4. Does electric discharge through gases take place at atmospheric pressure ?
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Q. 5. In a Thomson's set-up for determining e/m, the same high tension de supply provides potential to the anode of the accelerating column, as also to the positive deflecting plate in the region of crossed fields, If the supply voltage is doubled, by what
(Short/V. Short Answer Questions-1, 2 Marks)
1. What features of e.m. waves lead Maxwell to conclude that light itself is electromagnetic wave ?
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2. For an electromagnetic wave, write the relationship between amplitude of electric and magnetic field in free space.
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3. State tour properties or electromagnetic waves.
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4. Why sky waves cannot be used in television broadcasting ?
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5. What is the cut off frequency beyond which the ionosphere does not reflect electromagnetic radiations ?
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6. Give a diagram for which it is clear that "taller the antenna, longer the coverage of the
Very Short Answer Type Question
Q. 1. An electron is not deflected which moving through a certain region of space. Can you be sure that there is no magnetic field in the region ?
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Q. 2. An electron is moving along X-axis in a magnetic field acting along Y-axis. What is the direction of magnetic field acting on it ?
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Q. 3. What is the value of permeability of free space ?
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Q. 4. What is the direction of force between two parallel conductors carrying current in (i) same direction ; (ii) opposite direction ?
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Short Answer Type Questions
Q. 1. Name the nine plantes.
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Q. 2. What is 1 AU ?
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Q. 3. How were the crators caused on the surface of moon ?
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Q. 4. What is albedo of a planet ?
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Q. 5. State Hubble's law.
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Q. 6. What is order of mass of Sun ?
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Q. 7. What is Milky Way ?
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Q. 8. How is brightness of star represented ?
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Q. 9. What is the value of Solar Constant ?
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Q. 10.