give reason for the following (1) naphthalene balls kept in stored warm clothes disappear over a period of time (2) a fluorescent tube glows when electricity is passed through it (3) it is easier to remove fresh stains of ink from a cloth than stains caused a few day
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1: due to sublimation
2:because it have tungsten which has high melting point and it turns electric energy into light energy
2:because it have tungsten which has high melting point and it turns electric energy into light energy
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1) Napthalene balls undergo sublimation (i.e. a process in which solid substance changes its phase to gas without passing through liquid state).
2) An electric current in the gas excites mercury vapor which produces UV light which causes a phosphor coating on bulb to glow.
3) Yes, it is easier to remove a fresh stain of ink from cloth than stains which are caused a few days ago because if you try to remove the ink after days the ink particles will have diffused into the cloth of the shirt. This will prevent the cloth from removing the stain.
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2) An electric current in the gas excites mercury vapor which produces UV light which causes a phosphor coating on bulb to glow.
3) Yes, it is easier to remove a fresh stain of ink from cloth than stains which are caused a few days ago because if you try to remove the ink after days the ink particles will have diffused into the cloth of the shirt. This will prevent the cloth from removing the stain.
Hope it clears your doubt!
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