NCERT Solutions for Class 12 Physics Chapter 11

NCERT Solutions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Exercises Solutions and Additional Exercises Solutions to study online without downloading or download in PDF form to use it offline. Questions are based on updated NCERT Books for 2018-19.



NCERT Solutions for Class 12 Physics Chapter 11

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12 Physics Chapter 11 Exercises

NCERT Solutions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter exercises are given below to use it online. Click here to see the Additional Exercises questions of this chapter or go to 12 Physics main page.
NCERT Solutions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter




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12 Physics Chapter 11 Additional Exercises

NCERT Solutions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter additional exercises are given below to use it online. Click here to see Exercises Questions or move to Top of the page or go to 12 Physics main page.
12 Physics Chapter 11 Dual Nature of Radiation and Matter additional exercises solutions in pdf form




12 Physics Chapter 11 Dual Nature of Radiation and Matter additional exercises answers in pdf form
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Questions for Practice



  1. What is the stopping potential applied to a photocell, in which electrons with a maximum kinetic energy of 5.6 eV are emitted.
  2. If the amount of a radioactive substance is increased four times then how many times will the number of atoms disintegrating per unit time be increased?
  3. Why does only a slow neutron (.03eV energy) cause the fission in the uranium nucleus and not the fast one?
  4. In Bohr’s atomic model, the potential energy is negative and has a magnitude greater than the kinetic energy, what does this imply?
  5. The half life of a radioactive element A is same as the mean life time of another radioactive element B. Initially, both have same number of atoms. B decay faster than A. Why?
Try These
  • The work function of the following metal is given Na = 2.75 eV, K = 2.3 eV, Mo = 4.14 eV, Ni = 5.15 eV which of these metal will not give a photoelectric emission for radiation of wave length 3300 A0 from a laser
    source placed at 1m away from the metal. What happens if the laser is brought nearer and placed 50 cm away.
  • Why photo-electrons ejected from a metal surface have different kinetic energies although the frequency of incident photons are same?
  • Define distance of the closest approach. An alpha-particle of kinetic energy ‘K’ is bombarded on a thin gold foil. The distance of the closet approach is ‘r’. What will be the distance of closest approach for an alpha-particle of double the kinetic energy?
  • If the total number of neutrons and protons in a nuclear reaction is conserved how then is the energy absorbed or evolved in the reaction?
  • Particle of mass M at rest decays into two particles of masses m1 and m2 having velocities V1 and V2 respectively. Find the ratio of de-Broglie Wavelengths of the two particles.