Download App

Atomic and Nuclear Physics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsAtomic and Nuclear Physics1 Mark
Question
γ-rays radiation can be used to create electron-positron pair. In this process of pair production, γ-rays energy cannot be less than(a) 5.0 MeV(b) 4.02 MeV(c) 15.0 MeV(d) 1.02 MeV
       
✓

Answer

(d) 1.02 MeV

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Atomic and Nuclear Physics→Atomic and Nuclear Physics — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

Bohr’s atom model is the modification of Rutherford’s atom model by the application of:
→
The wavelength of light used in an optical instrument is $\lambda_1=4000 Å$ and $\lambda_2=5000 Å$. The ratio of their corresponding resolution powers will be :
→
When the convergent nature of a convex lens will be less as compared with air(a) In water (b) In oil(c) In both (a) and (b) (d) None of these
       
→
An electron is moving along the positive x-axis. You want to apply a magnetic field for a short time so that the electron may reverse its direction and move parallel to the negative x-axis. This can be done by applying the magnetic field along:
→
Excitation energy of a hydrogen like ion in its excitation state is 40.8 eV. Energy needed to remove the electron from the ion in ground state is:
→
In the depletion region of an unbiased P-N junction diode there are (a) Only electrons(b) Only holes(c) Both electrons and holes(d) Only fixed ions
   
   
→
A metallic particle having no net charge is placed near a finite metal plate carrying a positive charge. The electric force on the particle will be:
  1. Towards the plate.
  2. Away from the plate.
  3. Parallel to the plate.
  4. Zero.
→
A sine wave is travelling in a medium. The minimum distance between the two particles, always having same speed, is:
  1. $\frac{\lambda}{4}$
  2. $\frac{\lambda}{3}$
  3. $\frac{\lambda}{2}$
  4. $\lambda.$
→
Order of magnitude of density of uranium nucleus is $\left(\mathrm{m}_{\mathrm{p}}=1.67 \times 10^{-27} \mathrm{~kg}\right)$
→
Light of wavelength $\lambda$ falls on a metal having work function $\frac{\text{h}_\text{c}}{\lambda_0}.$ Photoelectric effect will take place only if:
  1. $\lambda\geq\lambda_0$
  2. $\lambda\geq2\lambda_0$
  3. $\lambda\leq\lambda_0$
  4. $\lambda<\frac{\lambda_ 0}{2}.$
→