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3 years ago

10

A flag is waved 3.2 m above the surface of a flat pool of water. A swimmer in the pool sees the flag at what distance above the

water? Let the indices of refraction nwater = 1.33 and nair = 1.00.
3.2 cm
2.4 cm
5.1 cm
4.3 cm

1 answer:

Romashka [77]3 years ago

6 0

Answer: 4.3cm

Explanation:

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The correct answer is the last one, "When the future level of some variable is seen as a function other than time".

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Answer:

121Sb=57.2%

123Sb=42.8%

Explanation:

We are given that

Atomic mass of 121Sb=120.904 amu

Atomic mass of 123Sb=122.904 amu

Average atomic mass of antimony=121.760 amu

We have to find the percent of each of the isotope.

Let x be the percent of 121Sb and 1-x be the percent of 123Sb.

Using formula of average atomic weight

Average atomic weight=atomic weight of 121Sb $\times$ percentage abundance of isotope 121Sb+atomic weight of 123Sb $\times$ percentage abundance of isotope 123Sb

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$121.760=120.904x+122.904(1-x)$

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$x=\frac{1.144}{2}=0.572$

Percentage of 121Sb= $0.572\times 100=$ 57.2%

Abundance of isotope 123Sb=1-0.572=0.428

Percentage of isotope 123Sb= $0.428\times 100=$ 42.8%

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