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Doping is the intentional introduction of impurities into an intrinsic semiconductor for the purpose of modulating its electrical, optical and structural properties.
The doped material is referred to as an extrinsic semiconductor.

Barium is a chemical element with symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element.

The search light produces and intense paralle beam of lightmThis requires a reflector of large aperture. when a source of light is placed at the focus o large concave mirror only the paraxial rays reflected as parellel beam but when a source is placed at the focus of a parabolic mirror then all the rays are reflected as intense parelle beam.

Anaemia results from a lack of red blood cells or dysfunctional red blood cells in the body. This leads to reduced oxygen flow to the body’s organs.
Symptoms may include fatigue, skin pallor, shortness of breath, light-headedness, dizziness or a fast heartbeat.
Treatment depends on the underlying diagnosis. Iron supplements can be used for iron deficiency.

choke is nothing but the coil/ballast ( inductor) which is used to induce high voltage across it. … Then gas inside the starter gets ionized due to this full voltage and heats the bimetallic strip that is caused to be bent to connect to the fixed contact.

Internal energy change =Heat absorbed – Work done.

Heat absorbed = 15 KJ and Work done = 5 KJ

So, Change = 15 -5 = 10 KJ

Banana bunchy top is a serious viral disease of bananas. Affected plants rarely produce fruit, which results in significant production losses and once plants have become infected there is no cure.
Backyard plantings of banana are common in Queensland and can be significantly affected by the disease.

Cuscuta is a parasitic plant. It has no chlorophyll and cannot make its own food by photosynthesis. Instead, it grows on other plants, using their nutrients for its growth and weakening the host plant.

Process of adding impurity to a pure semiconductor is called doping.
Depending on the type of impurities added, the semiconductor can be classified into p-type or n-type.
When the p-n junction is formed a few electrons from the n-type diffuse through the junction and combines with the holes in the p-side to form negative ions and leaves behind positive ions in the n-side. This results in the formation of the depletion layer, which acts as the barrier and does not allow any further flow of electrons from the n region to the p region.
As doping increases,width of depletion layer decreases.

The alcohol used in power alcohol is ethyl alcohol.
Ethanol is an organic chemical compound. It is a simple alcohol with the chemical formula C2H6O.
Its formula can be also written as CH 3-CH 2-OH or C 2H 5OH, and is often abbreviated as EtOH.
Ethanol is a volatile, flammable, colorless liquid with a characteristic wine-like odor and pungent taste.

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