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3 years ago

5

Bits of paper are attracted to an electrified comb or rod, even though they have nonet charge. How is this possible?

1 answer:

SashulF [63]3 years ago

7 0

Explanation:

An electrified comb is charged comb ( let say by running it through the hair) and when it is brought in the proximity of pieces of paper, the pieces tend to cling to it. This happens because the charged comb induces an opposite charge in the paper pieces and as opposite charges attract each other, the pieces are clinged.

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8. Three grams of Bismuth-218 decay to 0.375 grams in one hour. What is the half-

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Explanation:

This problem can be solved using the <u>Radioactive Half Life Formula</u>:

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$A_{o}=3 g$ is the initial amount of the material

$t=1 h$ is the time elapsed

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Knowing this, let's substitute the values and find $h$ from (1):

$0.375 g=(3 g)2^{\frac{-1h}{H}}$ (2)

$\frac{0.375 g}{3 g}=2^{\frac{-1h}{H}}$ (3)

Applying natural logarithm in both sides:

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