Quiz Bank

The basic difference between plane wave and spherical wave is that in plane wave disturbances propagated in single direction like string wave, while in spherical waves disturbances propagated outward in all directions from the source of wave.Light waves is an example of spherical wave. Plane waves In a plane wave disturbances travel in the single direction. Plane waves examples For ...

Microscope and telescope are two optical devices and are used for different purposes.Microscope is an optical device which is used to see very small objects ( Unicellular organisms),While telescopes is an optical instrument which is used to see very large objects in space.More difference between microscope and telescope are given in the table below.  microscope and telescope comparison table   ...

The emf (electromotive force) is the the potential difference between the terminals of a battery when no current is flowing through an external circuit when the circuit is open.Potential difference is the voltage across the terminals of the battery when the current is being drawn from it to an external. If you want to learn difference between emf and potential ...

There are three modes of heat transfer,conduction,convection and radiation.In the process of conduction heat transfer from hot body to cold body due to free electrons.In convection heat transfer due to actual movement of molecules,While in radiation heat transfer in the form of electromagnetic waves. There are three different ways of heat transfer.If you learn difference between conduction,convection and radiation,then you ...

Interference is the process of superposition of two waves having same wavelength ,amplitude and frequency.When the waves interfere,there is no loss of energy.During constructive interference ,the two waves are added up to give a resultant wave of large amplitude.During destructive interference ,the two waves having same wavelength and amplitude arrive out of phase and cancel each other’s effect.At the point ...

The damping devices are often used on machinery to increase the damping and reduce the vibrational effects caused due to running of machinery.These vibrational effects disturb the whole assembly and the building in which the machinery is working.The vibrational frequency of the machinery may cause the vibrations of large amplitude.To avoid this disturbance ,the damping devices are often used on ...

Comparison table :                   Astronomical telescope     Galilean telescope 1:In an astronomical telescope the eye piece is a convex lens. 1:In Galilean telescope the eye piece is concave lens. 2:It forms an inverted image. 2:It forms an erect image. 3:The length  of astronomical telescope is: L =f0   + fe   ...

The polarity of an unlabelled magnet is determined by following methods. First method: Suspend the magnet freely with the help of a thread so that it can oscillate freely.When magnet comes to rest ,one end always points towards the northern end of the earth.This end of magnet is thus called the North pole.Similarly,the other end of the magnet pointing towards ...

Electrons are negatively charged particles.When placed in an electric field ,negatively charged plate will repel them while positively charged plate will attract them.So,the electrons will move from negatively charged plate to positively charged plate.Since positively charged plate is at higher potential,while negatively charged plate is at lower potential.Therefore electrons tend to go from region of lower potential to a region ...

Both electron volt and joule are the units of energy.Since energies at atomic level are very small and are expressed in electron volt rather than Joule because Joule is a bigger unit.Hence the unit electron volt for energy is more convenient than joule,when we are dealing with atoms and nuclei to express the energy.