CBSE Delhi-Set-1-2004

The direction of magnetic field is shown in figure below,
 

The type of modulation scheme preferred for digital communication is pulse code modulation (PCM).

The required equation is given below:
 

Infrared rays.

The mass of heavy water is nearest to that of a neutron. This minimizes the chances of neutron absorption by heavy water. This is the reason for which we use it as moderator.

(i) Magnetic declination: The angle between the geometric meridian and magnetic meridian at a given place is called magnetic declination at that place. It is denoted by symbol().

(ii) Angle of dip: It is the angle made by the earth’s total magnetic field with the horizontal at a given place. It is denoted by symbol ().

The wavelength for the given frequency is given by the relation, 

 = c/v 

= (310⁸)/(510¹⁹) 

=( 610^-12)m 

= 0.006 A^o 

This wavelength of light falls into X-rays region, which can be used for,

(i) The treatment of certain diseases.

(ii) Diagnosis of diseases.

We have the relation,
m = m_o m_e = (L/f_o) x (D/f_e)

Here, L=20 cm, f_o=1 cm, f_e=2 cm.

 m = (20 / 1) x (25 / 2) = 250

The graph showing the variation of binding energy per nucleon with mass number of different atomic nuclei is given below, 

 The binding energy per nucleon for nuclei with high mass numbers is low because there is large coulomb replusion between the protons inside the nuclei.

First of all consider the figure below,

Now we have the relation, Q=CV.
or  C = Q/V.

For capacitor A we can write,

 C_A = Q/V_A

Similarly for capacitor B we can write,

 C_B = Q/V_B.

Here since V_A < V_B.

 C_A >C_B