a radioactive element has a half-life of 3,000 years. if a sample of this element begins with a mass of 60 grams, how long would you have to wait for the mass to decrease to 15 grams

Answers

Answer 1

Answer:

N = 60 g

Half life : N/2 = 3000

N/4 = 15 g


Related Questions

What is the equation for calculating the change in water potential? In other words, this equation allows you to determine which way the water will move in response to two different concentrations.

Answers

Answer:

The correct answer is - Ψ = ΨS + ΨP.

Explanation:

The movement of the water in a solution where is two different concentrations present can be determined by measuring the water potential (Ψ).

Water potential (Ψ) can be determined by the equation that depends on these two factors osmotic potential represent by ΨS and pressure potential represent by ΨP.

Ψ = ΨS + ΨP.

if an earthworm is 18mm long and is photographed and the picture is magnified 2.5x how long will it be in the picture?

Answers

Answer:

The earthworm will be 45 mm long in the picture

Explanation:

From the problem, we can take the original size of the earthworm to be 18mm.

Magnification  can be obtained using the formula:

magnification = observed size/ original size.

Recall, we are given that the magnification is 2.5.

Hence, can evaluate the size in the picture to be

2.5 X 18mm = 45mm

If you wanted to study the effects of soil moisture and light intensity on the growth of soybeans and required a high ability to regulate these independent variables, what type of experiment would you choose?A. Laboratory experiment.
B. Field experiment.
C. Natural experiment.
D. Reference experiment.

Answers

Answer:

A

Explanation:

The correct answer would laboratory experiment.

In the laboratory, variables can be controlled as much as possible using relevant equipment unlike in natural habitats or field experiments. For example, the amount of water that each plant would receive can be measured using measuring cylinders and the time they are applied can also be fixed.

Field and natural experiments require that experimental procedures are carried out in the field under natural conditions. Consequently, variables such as the amount of moisture that gets into the soil or the amount of light a plant will receive will be extremely difficult to control. Precipitation time and the duration of light can also not be controlled.

The correct option is, therefore, A.

Please help me (> ^<)ゞ

Although scientists are unable to explore the Sun's layers directly with instruments, they can measure the change in the speeds of the surface layers and the temperature of those layers from Earth Using this data, scientists have created models of the Sun and we
now know that the sunspots that form on the surface are the areas of coolest temperature for this stat. At the sunspots, temperatures are merely 3700 Kelvin (1) What does this indirect information about the Sun confirm?

A- The Sun has a structure similar to Earth's structure

B- Storms form on the surface of the Sun, similar to the atmosphere of Earth

C-The Sun's photosphere has properties of a solid, similar to the crust of Earth.

D-Convection occurs in parts of the Sun, similar to convection in the mantie of Earth

Answers

Answer:

I d k really but my educated guess is A- The Sun has a structure similar to Earth's structure  * even tho the suns structure is completely gaseous is similar to earth w the layers ii don't know  

Explanation:

Hope it Helped  !

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Put the following in correct order:
1.Bone is carved back into its original shape by osteoclasts 2.Blood is rushed to the area causing swelling
3.Hematoma is changed into bone by osteoblasts 4.Endorphins (the body's natural painkiller) is released 5.Hematoma(blood clot is formed)

Answers

Answer:

Im doing this in numbers btw from top to bottom.

Explanation:

5, First

2, Second

3, Third

1, Fourth

4. Last

Know what atomic mass and atomic number represent

Answers

He got it right i just took that test

Which functions are carried out by the water vascular system? Check all that apply.
movement
reproduction
respiration
transportation of food
transportation of water

Answers

Answer:

respiration, movement, transportation of water

Explanation:

Answer:

Movement, respiration, transportation of food, and transportation of water.

Explanation:

this is correct on edge :)

where is the most energy stored in the ATP molecule stored

Answers

Energy is stored in the covalent bonds between phosphates
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