Electromagnetic Waves — Physics STD 12 Science — Question

The de Broglie wavelength associated with a ball of mass 150g travelling at 30 ms⁻¹ is:

Light of frequency 8   is incident on a substance of photoelectric work function 6.125eV. The maximum kinetic energy of the emitted photoelectrons is

(a) 17eV

(b) 22eV

(c) 27eV

(d) 37eV

Two equal positive charges are kept at points A and B. The electric potential at the points between A and B (excluding these points) is studied while moving from A to B. The potential.

The X-ray beam emerging from an X-ray tube:

Which gates is represented by this figure

(a) NAND gate

(b) AND gate

(c) NOT gate

(d) OR gate

A chain reaction is continuous due to

(a) Large mass defect

(b) Large energy

(c) Production of more neutrons in fission

(d) None of these

Ampere’s circuital law is equivalent to:

In Young’s double slit experiment, the central bright fringe can be identified

(a) By using white light instead of monochromatic light

(b) As it is narrower than other bright fringes

(c) As it is wider than other bright fringes

(d) As it has a greater intensity than the other bright fringes

Change Q on a capacitor varies with voltage V as shown in the figure, where Q is taken along the X-axis and V along the Y-axis. The area of triangle OAB represents

(a) Capacitance	(b) Capacitive reactance
(c) Magnetic field between the plates	(d) Energy stored in the capacitor

If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength:

1. Will remain unchanged.
2. Will be doubled.
3. Will be halved.
4. Will become four times the original.