Tiêu đề SAMPLE PAPER(2025) -9.pdf ✅

Page 4 Sample Paper 09 CBSE Physics Class 12 SECTION-B 17. Write two uses of X -rays. 18. Plot a graph showing variation of current versus voltage for the material GaAs. 19. A uniform magnetic field gets modified as shown in the figure, when two specimens X and Y are placed in it. (a) (b) 20. Why does thermionic emission take place from a metal surface only? O Write the relationship of de-Broglie wavelength λ associated with a particle of mass m in terms of its kinetic energy E . 21. Draw equipotential surfaces due to a single point charge. Continue on next page.....