Physics
Definitions
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| Self
Inductance : The property of a coil (or a circuit) by
virtue of which it opposes any change in the amount of current
flowing through it is called its self-inductance. |
|
| Semiconductors
: Those materials whose electrical conductivity lies in between
conductors and insulators are called semiconductors e.g.
germanium, silicon
etc. |
|
| Secondary
Cells : A cell in which chemical action is reversible
is called secondary cell. |
|
| Spherical
Wavefront : If a point source in an isotropic medium is
sending out waves in three dimensions, the wavefronts are
spheres centered on the source. Such wavefront is called a
spherical wavefront. |
|
| Stopping
Potential : The minimum retarding potential (i.e. anode
negative w.r.t. cathode) at which photoelectric current becomes
zero is called stopping potential. |
|
| Single
Crystal : The crystal in which regularity of atoms or
molecules extends over the entire crystal is known as single
crystal. |
|
Semiconductor
: A semiconductor is a substance which has almost filled
valence band nearly empty conduction band with a small energy
gap( leV) separating the
two. |
|
| Semiconductor
Diode : A pn junction is known as a semiconductor diode
or crystal diode or junction diode. |
|
| Signal
: The information converted into electrical form that
is suitable for transmission is called a signal. |
|
| Space
Communication : The phenomenon of sending, receiving and
processing information through space is called space communication |
|
| Skip
Distance : The distance between the transmitting aerial
and the point where the sky wave is first received after returning
to earth is called skip distance. |
|
| Skip
Zone : The ground distance BC is called skip zone. No
signal can be picked up in the skip zone. |
|
| Solar
System : All objects bound in orbits by the sun's gravity
comprise the solar system. |
|
| Stars
: A stars is luminous gaseous heavenly body that generates
energy by means of nuclear fusion reaction in its core. |
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