Atoms — Physics STD 12 Science — Question

The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young’s double-slit experiment is

(a) Infinite

(b) Five

(c) Three

(d) Zero

The wave theory in its original form was first postulated by:

Two wave pulses travel in opposite directions on a string and approach each other. The shape of one pulse is inverted with respect to the other.

1. The pulses will collide with each other and vanish after collision.
2. The pulses will reflect from each other i.e., the pulse going towards right will finally move towards left and vice versa.
3. The pulses will pass through each other but their shapes will be modified.
4. The pulses will pass through each other without any change in their shapes.

The current density (number of free electrons per m³) in metallic conductor is of the order of:

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

1. Is monochromatic.
2. Has all wavelengths smaller than a certain maximum wavelength.
3. Has all wavelengths greater than a certain minimum wavelength.
4. Has all wavelengths lying between a minimum and a maximum wavelength.

Iron is :

For a crystal system, a = b = c, a = b = g  ¹ 90^o, the system is

(a) Tetragonal system	(b) Cubic system
(c) Orthorhombic system	(d) Rhombohedral system

Which among the following materials display higher magnetic susceptibility?