Assertion (A): In drawing an electric circuit analogous to a mechanical circuit, spring is replaced by capacitance.

Reason (R): The behaviour of a spring and capacitor are similar.

1. Maximum energy of electrons liberated photoelectrically is independent of light intensity
2. Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.

1. DPSK demodulator requires a device which operates at carrier frequency and provides a delay of bit time T_b
2. In DPSK, synchronous demodulation recovers the signal b(t) and the decoding of b(t) to generate d(t) is done at base band
3. In both DPSK and DEPSK errors always occur in pairs

Match the following:

1. higher speed as compared to other ADC
2. very good accuracy
3. good rejection of power supply
4. better resolutions compared to other ADC for the same number of bits

Assertion (A): When frequencies of signals fed to X and Y plates of CRO are multiples of each other, Lissajous pattern is displayed on screen.

Reason (R): In a CRO, the vertical deflection is proportional to voltage applied to Y plates.

1. Coordination number is four.
2. Packing fraction is 0.34
3. Copper crystallizes into diamond structure
4. Lattice is FCC.