Assertion (A): Field emission is substantially independent of temperature.

Reason (R): When a high electric field is created at metal surface field emission may occur.

Assertion (A): The steady state response, of a stable, linear, time invariant system, to sinusoidal input depends on initial conditions.

Reason (R): Frequency response, in steady state, is obtained by replacing s in the transfer function by jω

Assertion (A): Absolute instruments are used in standard laboratories.

Reason (R): Absolute instruments do not require calibration.

1. If ensemble and time averages of a random process are identical, the process is ergodic.
2. If ensemble and time average of a random process are not identical, the process is ergodic.
3. An ergodic process is stationary.
4. A stationary process is necessarily ergodic.