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katrin2010 [14]

3 years ago

8

Which statement accurately describes a light-year?(Select One) It is the shape of a galaxy. It is the distance that light travel

s in a year. It is a yearly measurement of light given off by stars. It is the amount of time it takes light to travel one million kilometers.

2 answers:

Vitek1552 [10]3 years ago

6 0

Answer:

B

Explanation:

edge 2020

Strike441 [17]3 years ago

3 0

Answer: B

Explanation:

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Answer:

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2 years ago

Which statement is true about this equation?

lara [203]

The appropriate response is the fourth one. The announcement is valid about this condition beneath is in spite of the fact that it is unequal, it can be adjusted by specifically utilizing observer particles.

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3 years ago

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The radioactive decay of a certain sample produced 846 disintegrations per minute. exactly 3.00 days later, the rate of decay wa

Margarita [4]

Answer:

$\boxed{\text{1.81 da}}$

Explanation:

1. Calculate the decay constant

The integrated rate law for radioactive decay is 1

$\ln\dfrac{A_{0}}{A_{t}} = kt$

where

A₀ and A_t are the counts at t = 0 and t

k is the radioactive decay constant

$\ln \dfrac{846}{269} = k \times 3.00\\\\\ln3.145 = 3.00k\\1.146 = 3.00k\\\\k =\dfrac{1.146}{3}\\\\k = \text{0.382 /da}\\$

2. Calculate the half-life

$t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{0.382} = \text{1.81 da}$

The half-life for decay is $\boxed{\textbf{1.81 da}}$ .

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3 years ago

How to answer this ?

nadezda [96]

You multiply (4×10)by*

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2 years ago

What part of the underside of a geckos feet allows it to stick to surfaces ?

belka [17]

Answer:

the foot is an intricate part of the body, consisting of 26 bones, 33 joints, 107 ligaments and 19 muscles

Explanation:

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