Monthly Archives: December 2011

Daily life science queries – 8

Q:- Why does a ball bounce up upon falling? Ans:- According to the Newton’s third law, to every action there is equal and opposite reaction. When a ball falls, it is temporarily deformed. Because of elasticity, the ball tends to … Continue reading

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Golden College of Engineering and Technology Gurdaspur

Golden College of Engineering and Technology is situated in the district Gurdaspur (Punjab) of India. Affiliated with: Punjab Technical University (PTU), Kapurthala Approved by: All India Council for Technical Education (AICTE), New Delhi. Courses offered:

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THERMAL CONDUCTIVITY OF METALS

In a solid, atoms vibrate about their equilibrium position at ordinary temperature and the amplitude of vibration decreases to a minimum at absolute zero of temperature .This vibration of atoms brings elastic distortion in the lattice and, therefore, the waves … Continue reading

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HEAT DEVELPOED IN A CURRENT CARRYING CONDUCTOR

Let us discuss the heat developed in a current carrying conductor and derive a relation for the same. According to Joule’s law, the heat developed in a conducting wire is given by I2 R, Where I is current flowing through … Continue reading

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Global Institute of Management and Emerging Technologies Amritsar

Global Institute of Management and Emerging Technologies is situated in the district Amritsar (Punjab) of India. Affiliated with: Punjab Technical University (PTU), Kapurthala Approved by: All India Council for Technical Education (AICTE), New Delhi. Courses offered:

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Global College of Engineering and Technology Anandpur Sahib Ropar

Global College of Engineering and Technology is situated in the district Ropar (Punjab) of India. Affiliated with: Punjab Technical University (PTU), Kapurthala Approved by: All India Council for Technical Education (AICTE), New Delhi. Courses offered:

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CLASSIFICATION OF MATERIALS ON THE BASIS OF CONDUCTIVITY

CLASSIFICATION OF MATERIALS ON THE BASIS OF CONDUCTIVITY On the basis of conductivity ,the materials can be classified in to following categories:- (a)    Conductors:- These are those materials whose electrical conductivity is very high. Conductors conduct charges very easily . … Continue reading

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Clausius Mossotti equation

STATIC DIELECTRIC CONSTANTS OF SOLIDS As discussed in the previous articles,the dielectric polarization can be considered to arise from three major sources: Electronic ,ionic and orientational (dipolar) polarizations ,that is Ptotal =Pe+Pi+P0 Thus, the materials may be classified into three … Continue reading

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Common daily life science queries – 7

Q:- Why stars twinkle? Ans:-  Do you know the phenomenon of refraction? Refraction is the bending of light as it moves from one medium to another. Our air has many layers. The light from a star reaches us after refraction … Continue reading

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Matthiessen’s Rule

Electron Scattering and Matthiessen’s Rule Matthiessen’s Rule: The resistivity ρ of a metal containing small amount of impurities may be written as: ρ = ρ0i+ ρ(T)                                                          (1) Where ρ 0 is a constant which increases with increasing impurity content and … Continue reading

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