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3 years ago

13

Evan drew a diagram to illustrate radiation. A yellow sun in a black background sends red curved arrows to the Earth What do the

arrows represent? gases mixing with particles liquid moving through a vacuum moving particles electromagnetic waves

1 answer:

Flura [38]3 years ago

7 0

Answer:

electromagnetic waves

Explanation:

plz mark brainliest

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KMnO4<br><br> Assign oxidation numbers to each element in this compound.

zysi [14]

K=+1

Mn= +7

O= -2

That’s it!!!

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3 years ago

Physical activity and exercise typically lead to __________.

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3 years ago

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The half life of radon-222 is 3.8 days. How Much of a 100g sample is left after 15.2 days

professor190 [17]

Answer:

6.2 g

Explanation:

In a first-order decay, the formula for the amount remaining after <em>n</em> half-lives is

$N = \frac{N_{0}}{2^{n}}$

where

<em>N</em>₀ and <em>N</em> are the initial and final amounts of the substance

1. Calculate the <em>number of half-lives</em>.

If $t_{\frac{1}{2}} = \text{3.8 da}$

$n = \frac{t}{t_{\frac{1}{2}}} = \frac{\text{15.2 da}}{\text{3.8 da}}= \text{4.0}$

2. Calculate the <em>final mass</em> of the substance.

$\text{N} = \frac{\text{100 g}}{2^{4.0}} = \frac{\text{100 g}}{16} = \text{6.2 g}$

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3 years ago

Convert the scientific notation to a decimal number. Type the correct answer in the box. 4 × 10-5 cm = cm

MakcuM [25]

Answer:

$4 * 10^{-5}cm = 0.00004cm$

Explanation:

Given

$4 * 10^{-5}cm = [\ ]cm$

Required

Solve

Apply law of indices

$4 * \frac{1}{10^5}cm = [\ ]cm$

Evaluate 10^5

$4 * \frac{1}{100000}cm = [\ ]cm$

$4 * 0.00001cm = [\ ]cm$

$0.00004cm = [\ ]cm$

Hence:

$4 * 10^{-5}cm = 0.00004cm$

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3 years ago

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Answer:

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4 years ago