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why we feel sky blue in color the blue color of the sky is because of rayleigh scattering as light moves by the atmosphere most of the longer
explain shape of the earth shape and size of the earth the shape of the earth is regarded as a sphere but it is mainly an oblate spheroid like as egg
what is equatorial and polar diameterthe equatorial diameter the equatorial diameter of the earth is 7920 miles in length and polar diameter is about
magnetic effect of the earth ismagnetic effect of the earth the earth behaves as it has got a big magnet running as mot a big magnet running almost
distance of the earth from the moon and the sun isthe distance of the earth from the moon is 240000 miles or24 x 104 miles and that from the sun is
what is the sunthe sun- sun the brightest object in the universe it is main body of the solar system it has a luminous sphere approximately
what are the starsthe star is made of dust and gas in spaceessentially it has many stages they are1black hole2nuetron star3supernova4red giant
explain the planetsthe planets- we know in the solar system that the sun is set and that moving round it are a number of large spheres called as
what is eclipsessun is a luminous body while earth and moon are non-luminous bodies only those parts of moon on the light of sun falls is visible
what is vapor densityvapour density is the density of a vapour in relation to that of hydrogen it may be defined as mass of a certain volume of a
what the main defination of currentelectrical current is a measure of the amount of electrical charge transferred per unit time it represents the
explain the elementary particles and particle acceleratorsmore than 100 particles smaller than the proton electron and neutron have been discovered
what is atomic modelsthe concept of atoms was first suggested by the ancient greeks the atom was supposed to be the smallest piece of matter then j j
explain the wave particle dualityany object in the world can be considered to be a particle or wave and will exhibit properties of both for example a
explain radioactivity and its problems and applicationsall radiation electromagnetic as well as the kind from nuclear decay takes its toll on living
explain the meaning of nuclear fusionfusion happens when two light atoms like hydrogen or lithium combine there is a net loss of mass which is
define the nuclear poweras an energy source nuclear power is an alternative to fossil fuels controlled nuclear chain reactions are used to
explain the energy and massalbert einstein described an intricate relationship between matter and energy it is summarized in the famous formulae
define radioactive datinghalf-life measurements of radioactive elements in rocks and fossils can be used to determine the age of the specimen one of
explain the half-lifethe decay of a nucleus is a random event it is not possible to predict which nucleus will decay and when even though
what is the meaning of polarizationpolarization is a quality that is only exhibited by transverse waves for light waves the polarization identifies
you have two pendulums and you release them at the same time pendulum a has mass 2 m attached to it and you release it from 5
what is illuminationa body that gives off light is called luminous like all those glow-in-the-dark toys and a body that gives off light when it is
illustrates the electric motorsan electric motor is basically the reverse of an electric generator it is a machine which turns electrical energy -
what are switches and fuses as mentioned earlier short circuits can be damaging to the voltage source one way we have developed to protect equipment