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ENERGY LEVELS
The energy levels, measured in electron volts (e.v.) in which orbiting electrons exist comply with a law of physics which states that energy can be given to electrons only in discrete amounts (quanta) which means that there are energy values that an electron cannot acquire. From this it can be deducted that there is a forbidden energy gap between each of the allowed energy bands K to O.
The width of the forbidden energy gap between the top of the valence band and the bottom of the conduction band determine the electrical conducting properties of materials.
Determine the ratio of the frequencies of harmonics in an air column of same length in a) a closed pipe and b) an open pipe
Q. What is ionisation potential energy? For hydrogen atom the energy necessary to remove an electron from first orbit to its outermost orbit (n=∞) is 13.6-0 = 13.6eV. This ene
An egg beater Study an egg beater, hand drill or some other device in which an enhance of speed is obtained by means of gears.
Q. A transistor is connected in CE configuration. The voltage drop across the load resistance ( Rc) 3 k is 6 V. Find the base current. The current gain α of the transistor is 0.97.
Which of the subsequent conditions must be met in order for a uniform magnetic field to exert a force on a particle? Ans: A charged particle has to be in a magnetic ground
When a hard element is suspended from an axis and made to oscillate about that, then it is known as compound pendulum. C = Initial position of center of mass C' = Position of
The points of maximum amplitude are called as antinodes. At ends density and air pressure both are very low.
why electric field is zero inside a cavity
a projectile is fired from a gun has an initial velocity of 90.0 Km/h at an angle of 60.0 degrees to the horizontal. When the projectile is at top of its trajectory an internal exp
Its working is based on the principle of tangent law. It having of a small compass needle, pivoted at the centre of a circular box. The box is reserved in a wooden frame having two
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