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bohrs radius can have1 discrete values2 ve values3 - ve values4 fractional valuesans ve
who modified bohrs theory by introducing elliptical orbits for electron path1 hund2 thomson3 rutherford4 sommerfieldans
the energy of an electron revolving in n th bohrs orbit of an atom is given by the expression1 en 2pi2 me2 z2n2h2
the expression for bohrs radius of an atom is1 r n2h2 4 pi 2me4z2
if wavelength of photon is 22x10-11m h 66x 10-34 j-sec then momentum of photon is1 3x 10-23kgms-1 2
the energy of an electron in orbit of hydrogen atom is1 136n4x ev 2
what is the packet of energy called 1 electron 2 photon 3 positron
the frequency of an electromagnetic radiation is 2x 106 hz what is its wavelength in metres velocity of light 3x108 ms-1160x
the postulate of bohr theory that electrons jump from one orbit to the other rather than flow is according to1 the quantisation concept 2
a moving particle may have wave motion if1 its mass is very high2 its velocity is negligible3 its mass is negligible4 its mass is very high and
when an electron revolves in a stationary orbit then1 it absorbs energy2 it emits radiation3 its energy remains constant4 it gains kinetic energyans
experiment on archimedes principlesolder a cycle valve to single half of a copper ball tap float load inside the other half with lead or lead
the energy of second bohr orbit of the hydrogen atom is -328 kj mol-1 hence the energy of fourth bohr orbit would be1 - 41 kj mol-12 -1312 kj mol-1
when beta -particles are sent through a tin metal foil most of them go straight through the foil as 1beta -particles are much heavier than
which of the following statements does not form part of bohrs model of the hydrogen atom1 energy of the electrons in the orbit is quantized2 the
experimental evidence for the existence of the atomic nucleus comes from1 millikans oil drop experiment2 atomic emission spectroscopy3 the magnetic
when an electron jumps from lower to higher orbit its energy1 increases2 decreases3 remains the same4 none of theseans
when an electron drops from a higher energy level to a low energy level then1 atomic number decreases2 energy is absorbed3 atomic number increases4
making a model hydraulic elevatorsome freight and passenger elevators are increased by water pressure you can make a model of one of these with an
water will not compressfit a soda water bottle with a one-hole stopper by the stopper place the glass tube from a medicine dropper narrow end up fill
raising heavy weights by water pressureget a rubber hot-water bottle put a one- hole stopper carrying a short glass tube tightly in the neck punch a
the wavelength of a spectral line for an electronic transition is inversely related to1 the number of electrons undergoing the transition2 the
upward and downward pressure are the same at any given depthget a glass cylinder at least 15 cm long and 4 cm in diameter such a length of tube can
water pressure is the same in all directionspunch holes around the base of a tall tin can with a nail wrap the holes as above with a strip of tape
another way to show that water pressure increases with depthsearch a tall tin can punch holes up the side of the can about 3 cm apart put a strip of