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states of matter
pre-test active
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time re
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gold's natural state has a definite shape and a definite volume. what is gold's natural state(s)?
solid
liquid
solid or gas
liquid or gas

Gold is mostly occurring in solid state in its natural form.

Option A

Explanation:

Gold is one of the noble metals used by aristocrats. It mostly occurs in the forms of grains or in the forms of rocks. Pure gold cannot be obtained naturally, as gold will be mostly alloyed with silver.

In natural state, gold will be the shiny metal with yellow or pale yellow color and it will be in solid state. They are malleable metal which can be easily mold into different shapes.So among the given options, the natural state of gold is solid state and not liquid and neither gas.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach