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the atmospheric pressure at any position is numerically similar to the weight of a column of air of unit cross-sectional area extending from that
when an electron makes transition from higher energy level having energy e2n2 to a lower energy level having energy e1 n1 then a photon of frequency
binding energy of a system is described as the energy released when its constituents are brought from infinity to form the system it can also be
in x-ray tube when high speed electrons strike the target they move into the target they lose their kinetic energy and come to rest inside the solid
i x-rays are electromagnetic waves with wavelength lie among 01aring - 100aringii x-rays is invisibleiii they always go in a straight line
depending upon the penetration power there are two parts of x-rayshard x-raysmore penetration powermore frequency of the order of asymp 1019 hzlesser
x-rays was discovered by scientist rontgen thats why they are also known as rontgen pulsesrontgen discovered that when pressure inside a discharge
a device which changes light energy into electrical energy is known as photoelectric cell it is also known as photocell or electric
it is the phenomenon of emission of electrons from the surface of metals when light radiations electromagnetic radiations of suitable frequency drop
according to eisensteins quantum theory light propagates in the bundles of power every packet being called as photon and possessing
it is explained by heisenbergs uncertainty principle it is impossible to calculate simultaneously both the position and the momentum of the
i a matter pulse is not electromagnetic in behaviorii practical observation of matter waves is possible only when the de-broglie wavelength is of the
i these are positive ions having similar mass if the experimental gas does not have isotopes however if the gas has substances then positive pulses
cathode rays discovered by sir willium crooke are the stream of electrons they may be given by using a discharge tube containing gas at a low
the process of changing of a heavy nucleus into two lighter nuclei of comparable masses after bombardment with a energetic particle with liberation
the neutrons and protons in a stable nucleus are held together by nuclear forces and energy is required to pull them infinitely apart or the similar
the nuclei have been separated on the basis of the number of protons atomic number or the total number of nucleons mass number as given belowi
fast neutrons can be changed into slow neutrons by certain materials known as moderators when last moving neutrons pass by a moderator they
neutron is a fundamental particle which is necessary constituent of all nuclei except that of hydrogen molecule it was discovered by chadwick1 the
rutherfords alpha-scattering experiment recognized that the mass of atom is concentrated with small positively charged region at the centre which is
in a perfect instrument the zeros of the major scale and circular scale coincides with each other in that situation screw gauge has zero-error or
rules to verify how many significant numbers has in a calculated quantity1 all nonzero digits are significant as like 457 cm has three
i the size examines cannot be operated to derive relations other than product of power functions for example s ut 12 at2 or y y0 cosomegat and
rule 1 in order to sum or subtract two physical quantities the quantities must have the similar dimension the final physical quantity has the similar
kelvin kelvin is the fundamental unit of temperature it has quantity of zero where the molecular activity of gases ceasesmole mole is the fundamental