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A device which is used to convert light energy directly into electrical energy is called as photovoltaic cell or a solar cell.

Heliostats convert light energy into heat energy.

A thermocouple is a device for measuring temperature.

Partition is the word which is used for separation, dividing, mark off, etc... Compunding, union, attaching, total, etc... are antonyms of partition.

Here in the given options, The girl, whom you have met yesterday is my sister is the sentence which has relative pronoun.

The pronoun which is used to connect a clause or phrase to a noun or pronoun is called as relative pronoun.

The most common relative pronouns are who, whom, whose, which, and that. Sometimes when and where can also be used as relative pronouns.

The compound MgCl2 is named as Magnesium Chloride.

If the barometer rises, it indicates that good or fair weather is coming and if the falling barometer reading indicates that bad or foul weather is coming. Usually bad weather approaches from the west direction.

We require vitamins B & C for hair growth. But Vitamin B such as Vitamin B7 or Biotin is required for the growth of hair.

Niacin is the name for vitamin(B3).

Liver can produce small amount of niacin from tryptophan.

To produce 1 mg of niacin we require 60 mg of tryptophan.

Radioactive decay is likely to occur when the nuclei of an atom doesn't have enough binding energy to hold the nucleus together due to excess of rotons or nutrons in it.