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kow [346]
3 years ago
8

What element has 81 protons in the nuclei of atoms

Physics
1 answer:
Margarita [4]3 years ago
3 0
<span>Thallium. 81 Protons, post-transitional metal that is not found in nature. </span>
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How know that rocks formed from the seafloor sediments deposited in the Amadeus basin were softer than the arkose sandstone
svp [43]
The rocks formed from the seafloor sediments deposited in the Amadeus basin were softer than the Arkose sandstone because the Amadeus basin were made up of marine and non-marine sedimentary rocks which are softer compared to quarts which make up mostly the Arkose sandstone.
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When atoms are split, they release energy. This concept applies to (2 points)
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6 0
3 years ago
When a potential difference of 13 V is placed across a resistor, the current in the resistor is 1.4
vitfil [10]
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3 years ago
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5 0
3 years ago
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A fish inside the water 12cm below the surface looking up through the water sees the outside world contained in a circular horiz
serg [7]

Answer:

13.6 cm

Explanation:

From Snell's law:

n₁ sin θ₁ = n₂ sin θ₂

In the air, n₁ = 1, and light from the horizon forms a 90° angle with the vertical, so sin θ₁ = sin 90° = 1.

Given n₂ = 4/3:

1 = 4/3 sin θ

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sin θ = x / √(x² + 12²)

sin θ = x / √(x² + 144)

Substituting:

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9/16 x² + 81 = x²

81 = 7/16 x²

x ≈ 13.6

4 0
3 years ago
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