Basic Operations of Digital Electronics (Physics-19.11)
There are many things which have only two possible states. For example a circuit can be either on or off. It cannot have a third state. Similarly, a given statement would be either true...
Category: 9th 10th
Transistor (10th-Biology-Lesson-19.7)
If a crystal of germanium or silicon is doped in such a way that n-type regions are formed at its two sides with a very thin p-type region in between, it forms an n-p-n...
Semi-Conductor Diode as a Rectifier (Physics-Lesson-19.9)
Ordinarily electricity is provided to us in the form of alternating voltage but most of electronic devices operate by direct current (D.C). Therefore, it becomes necessary that we convert the alternating voltage to D.C....
Semi - Conductor Diode (10th-Physics-Lesson-19.8)
When the p and n-regions of a p-n junction are connected to metallic wires and enclosed in a glass or a metallic case in such a way that only the wires connected to n...
P-N Junction (10th-Physics-Lesson-19.7)
If a crystal of silicon or germanium is doped in such a way that its one part becomes n-type and the other p-type, then a p-n junction would be formed in between. On one...
Doping, N-Type, P-Type Semi-Conductors (Physics-19.4,5,6)
Doping 19.4 A semi-conductor, in its purest form is not such a good conductor, so it is of little practical value. But it can be rendered useful by increasing the number of holes and...
Semi Conductor (10th-Physics-Lesson-19.3)
The material objects, on the basis of electrical properties, are classified in three groups: Conductor The substances in which electric current flows easily are called conductors. Usually, metals are good conductors. For example gold,...
Radiation Hazards (10th-Physics-Lesson-18.7)
We have already read that radiations are very useful in many ways for mankind. Radiations are being used in different ways in medical, agriculture and in some industrial units, but there is always danger...
Nuclear Fission (10th-Physics-Lesson-18.6)
In 1938, Ottohann and Stresemann bombarded slow neutrons on uranium. As the neutron is a neutral particle, so it was expected that the uranium nucleus will absorb the neutron and become a heavy uranium...
Uses of Radio Isotopes (10th-Physics-Lesson-18.4)
18. 4 Uses of Radio Isotopes Although, all the isotopes of an element chemically behave identically, but every isotope emits specific radiations due to which it is easy to identify an isotope. It is...
