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PolarNik [594]
2 years ago
12

The graph below shows the radioactive decay of a material whose half life is 25 years.

Biology
1 answer:
yawa3891 [41]2 years ago
5 0
The half life is the time taken for the amount of a substance to become half of its original value. If we take the initial value to be 30 on the y-axis, the half of 30 is 15. We check the time at which the substance has reduced to 15 atoms and this is about 40 seconds. <span>40 seconds therefore, is your answer.</span>
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The common cold is caused by a virus that infects the upper respiratory tract causing local inflammation. it is clinically calle
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<span>The word Coryza comes from Greek word "kóruza" which means "</span>nasal mucus".

The infection of the upper respiratory tract by the virus will induce an inflammatory reaction that will lead to secretion of thin watery mucus. The patient will have a runny nose and/or nasal congestion with loss of ability to smell.
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Which of the following is not a common use for public land?
AleksandrR [38]

The answer is A. Logging

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Read 2 more answers
Calcule la molalidad de una<br> 20g Ca Cl₂ en 250g de<br> que contiene<br> solucion<br> H₂O.
ahrayia [7]

Answer:

The solution is 0, 90 molal. See the explanation below, please

Explanation:

Molality is defined as moles of solute in 1 kg of solvent (1000 grams). The following three simple rule must be performed:

We calculate the weight of 1 mol of CaCl2

Weight Ca =40, 078 g

Weight Cl= 35, 453 g

Weight of 1 mol of CaCl2=40, 078g + 2x (35, 453g )= 110, 98g

110, 98 g ---1 mol

25 g---X= (25g x1 mol)/110, 98g= 0,23mol

250g solvent -----0,23 mol CaCl2 (the solute)

1000g solvent ----X = (1000g x0,23mol)/250g =0,90 mol solute

The solution is 0,90 molal

8 0
2 years ago
4. If seismographs showed a specific region as earthquake prone, what proposed solutions
Gwar [14]

Answer:

Avoid making multistory buildings and provides safety exits.

Explanation:

Avoid making multistory buildings and provides safety exits in every commercial and housing building are the solutions that could lessen the damage of potential earthquakes. High multistory building greatly damaged from the earthquake because the buildings can't bear high intensity of earthquake so they falls to the ground and cause great damaged. Safety exits are necessary for the safely evacuation of people from the buildings during earthquake or another natural disaster.

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The graph shows the altitude and temperature for different layers of Earth’s atmosphere. Based on the diagram, which of the foll
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The statement that is correct regarding the troposphere and the stratosphere is The ozone layer is in the stratosphere. The third one is true. The ozone layer acts as a protection layer that prevents UV light.

<h3>What are the layers of the atmosphere?</h3>

The atmosphere is divided into many layers, with the troposphere close to the earth and the thermosphere toward the sun, as shown in the diagram. in between two layers, such as the tropopause, which is present between the troposphere and the stratosphere. In the stratosphere, the ozone layer is present, which prevents the sun's UV rays from falling on the earth, and the troposphere is the region where the clouds are formed.

Hence, the correct answer is the third option, which is "The ozone layer is in the stratosphere."

Learn more about the atmosphere here.

brainly.com/question/25881294

#SPJ1

3 0
1 year ago
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