Home » Author Archives: admin (page 16)

Author Archives: admin

What is difference between excitation and ionization potentials?

Excitation potential The potential required to lift an electron from ground state to some higher state is called excitation potential. Or If the energy supplied to an electron is such that the electron is lifted from its ground state to one of the higher allowed orbits,the atom will be excited and the energy supplied is called excitation energy or excitation ...

Read More »

What are some applications of a step up and step down transformer?

Applications of a step up transformer For Transmission of electric power from power station to consumer,voltage is step up by using step up transformer.It minimizes the power loss in transmission line. Applications of a step down transformer Step down transformer decrease the voltage to a safe value at the end of the transmission line where the consumer of electric power ...

Read More »

Why would power distribution systems be less effective without alternating current?

Most larger power distribution systems are AC.The power is transmitted from power stations at much higher voltage to minimize the power loss.At the end of the line where the consumer is located,the voltage level is reduced to a safe value for domestic use.The crucial factor is that it is much easier to increase and decrease AC voltage than DC,so AC ...

Read More »

Ultrasound frequency range

What is ultrasonics? The study and application of mechanical vibrations with frequencies beyond the limits of hearing of the human ear i.e ,with frequencies about 20 kHz and upwards.There is no theoretical upper limit to the ultrasonic frequency ,although ultrasonic applications are usually restricted to about 20 MHz.Ultrasonic waves have the same basic properties as sound waves,both being examples of ...

Read More »

Hall effect and its applications in semiconductors

“An effect when occurring when a current carrying conductor is placed in a magnetic field and orientated so that the field is at right angles to the direction of the current.”This is the Hall effect, named after E. H. Hall who discovered it in 1879.The difference of potential produced is called the Hall emf. An electric field is produced in ...

Read More »

Does the sun do any work on earth?

No work is done on the earth revolving around it in perfectly circular orbit.The earth revolves around the sun due to gravitational force of attraction between the sun and the earth.This gravitational force provides centripetal force to the earth to revolve around the sun.Since centripetal force is always directed towards the centre of the orbit.This centripetal force is always perpendicular ...

Read More »

Is energy quantized in classical physics?

No,according to classical wave theory the emission of electromagnetic radiations from the surface is continuous. So energy is not quantized in classical physics.But according to photon theory the emission of electromagnetic radiation from the surface is discontinuous.Energy is quantized and radiations are emitted in the form of bundles of energy is called quanta or photon.Each photon has energy given as: ...

Read More »

Types of radioactive decay:Alpha,beta and gamma decay

What is radioactive decay? “Radioactive decay  is the process by which the nucleus of an unstable atom loses energy by emitting radiation, including alpha particles, beta particles, gamma rays and conversion electrons.” Most of the nuclides that have been identified are radioactive.That is,they spontaneously emit a particle,transforming themselves in the process into a different nuclide . In this section we discuss the two ...

Read More »

Ampere’s law and its applications in daily life

What is ampere’s law? According to this law “The line integral of magnetic field B along a closed path due to current is equal to the product of the permeability of free space and the current enclosed by the closed path”. Mathematically it is expressed as: Where μ0=permeability of free space i=current flowing through the conductor. Proof: Consider a straight ...

Read More »

gravitational potential energy : Definition,formula and examples

Gravitational potential energy is defined as the “energy of an object due to Earth’s gravity”.OR it is the product of objects weight and height.It is the most common example of P.E. Its formula is:       W = mgh It means the higher an object the higher will be its Gravitational P.E. Examples of gravitational potential energy in everyday life ...

Read More »