difference between analog signal and digital signal

. The incoming radio frequency signal is mixed with an internally generated signal from a local oscillator in the receiver. The output of the mixer has a carrier frequency equal to the difference between the transmitted carrier frequency and the locally generated frequ..

Scattering of Light - When light passes through a substance or gas, a part of it is absorbed and the rest scattered away. The basic process in scattering is absorption of light by the molecules followed by re-radiation in different directions. The strength of scattering can be measured by..

The impedance of LCR is In expression (1), I o has different values for different frequencies. But I o has a maximum value when Z is minimum. i.e., when X L = X L c or Z = R since w = 2 p f This frequency for which the current in AC circuit reaches a peak value and th..

Polar orbits are used to watch the earth. They are the planes perpendicular to equatorial plane. Satellites in polar orbit are low enough to collect the information about earth in detail. Low earth orbit is the easiest and cheapest to reach, lying just above the atmosphere a few hundred miles up...

In eukaryotes, the genes that code for the enzymes needed to catalyse the various steps of a particular metabolic pathway may not be adjacent or even be in different chromosomes. However, these genes are regulated by operon model as in bacteria. Both the inducible and the repressible syst..

Gene Regulation in Eukaryotes - In eukaryotes, the genes that code for the enzymes needed to catalyse the various steps of a particular metabolic pathway may not be adjacent or even be in different chromosomes. However, these genes are regulated by operon model as in bacteria. Both the in..

. It is an amazing fact that the charge carriers get this signal of direction change is propagated at the speed of light. What difference does it make if direct current flows or an alternating current flows in a conductor? As far as the heating effects are concerned such as ligh..

Two metal plates are sealed in a vacuum tube. If light of reasonably short wavelength is made to fall on the plate (emitter). If a high potential, difference is applied to the plates, making the emitter negative and the collector positive a photocurrent is registered in the ammeter conne..

Principles of Light Modulation - Let us consider the case of electromagnetic radiation in an ionised medium. Suppose we increase/decrease the amplitude of an electromagnetic wave passing through an ionised gas. These modulations of the electromagnetic wave could contain coded information (Morse cod..