We inflate a balloon on the edge of a swimming pool. What happens to the volume of the balloon?

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

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