Home » Quiz Bank (page 3)

Quiz Bank

What is difference between photon and electron?

Properties of Photon A photon has no rest mass because it cannot be at rest with respect to an observer. A photon moves with the velocity of light. A photon is charge less particle. Momentum of the photon with frequency ν is: P=hν/c Properties of Electron An electron has mass and may be at rest. An electron cannot move the velocity ...

Read More »

Does a photon have a de Broglie wavelength?

Yes a photon has de Broglie wavelength.In 1924,Louis de Broglie proposed that a particle must also act like wave,in silmilar way,wave behave like particles. In de Broglie hypothesis an electromagnetic wave is the de-Broglie wave for a photon moving with speed c.According to de-Broglie ,the wavelength of the photon is given by the relation: λ = h/p Where P is ...

Read More »

X rays uses,properties and applications

What are X rays ? X-rays are the electromagnetic waves which are emitted by the atoms of those metals which have large atomic number,large number of protons in their nuclei so that the pull of the nuclei on their electrons is very large.When an electron of K or L shell of such an atom is displaced from these shells to ...

Read More »

What is difference between free and forced oscillations?

Free Oscillations A body is said to be executing free vibrations when it oscillates without the interference of an external force.For example,when simple pendulum is slightly displaced from its mean position vibrates freely with its natural frequency that depends only upon length of pendulum. Forced Oscillations If an oscillating system is subjected to an external periodic force,then forced vibrations will ...

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 »