Radium has a half-life of 1,620 years. In how many years will a 1 kg sample of radium decay and reduce to 0.125 kg of radium?3,240 years

6,480 years

4,860 years

1,620 years

Answers

Answer 1

Answer: 4680 years

1 x .5 = .5

.5 x .5 = .25

.25 x .5 = .125

You multiplied 3 times, so 3 times 1,620 is 4,680.

Related Questions

Organisms that live in desert and desert-scrub biomes have developed unique adaptations that aid in their survival. The Sahara Desert takes up ten percent of the continent of Africa, and is the largest desert in the world. The species that live in the Sahara are highly adapted to survive in the extreme conditions they live in. What morphological and physiological adaptations might be seen in the organisms that live in the Sahara Desert?a. water absorbing skin, large eyes for hunting at night, webbed feet b. light colored fur or feathers for camouflage, dense layer of fat and fur for warmth, hibernation during cold months c. small bodies and long limbs in warm-blooded organisms, light colored fur or feathers to reflect sunlight, lack of sweat glands in many organisms, hibernation during hot months d. dark colored fur or feathers for heat absorption, large bodies and short limbs, consumption of primarily scrub and short grasses
You will have the following equipment available to you to monitor temperature and carbon dioxide and oxygen. This data will be useful to study the effect of temperature on cricket metabolic rate because
Which statement best describes the relationship between proteins and nucleic acids? Proteins read the instructions that are contained in nucleic acids. Nucleic acids synthesize the amino acids for protein construction. Nucleic acids provide the blueprint for the construction of proteins. Proteins are composed of nucleic acids..
Which of the following statements about the effects of pollution on marine ecosystems is true?a.Burning fossil fuels causes a direct increase in the temperatures of ocean water.b.Burning fossil fuels causes a decrease in the pH of ocean water making it more acidic.c.Pollution in marine ecosystems causes a decrease in the formation of algal blooms.d.Addition of warm water has no effect on marine ecosystems.
Is rust eating a hole in a metal bucket living or nonliving?

Jenna says that an example of homeostasis is when body temperature is maintained at about 37° C. Allen says homeostasis is when breathing rate increases along with exercise. Who is correct? A. Only Allen is correct. B. Both are correct. C. Only Jenna is correct. D. Neither is correct.

Answers

B. Both are correct

Both are correct is the accurate answer. Why? Because as Jenny said our body maintains our temperature at approximately 37C which is the conditional temperature where our cells could do significant and existential processes. Also is maintained by the hypothalamus. Moreover, when we exercise, the amount of oxygen decreases thus muscles around the thoracic region increase the breathing rate.

Seed leaves are called _____.
cotyledons
endosperm
sepals
tendrils

Answers

Answer:

The correct answer would be cotyledons.

The cotyledons or seeds-leaf are defined as the primary leaf present in the embryo within the seeds of the higher plant.

After germination, the cotyledons may become the first leaves of the seedling.

The species of plants which possess one cotyledon are termed as monocotyledons whereas the species which possess two cotyledons are termed as dicotyledons.

Seed leaves, or cotyledons, are the first leaves to appear from a germinating seed and provide nutrients to the developing plant. Therefore, the correct answer is option a.

Cotyledons are the first embryonic leaves or leaf-like structures that appear in the seeds of flowering plants (angiosperms) as they germinate.
Cotyledons serve as nutrient storage structures and provide initial nourishment to the growing seedling until it can establish its own photosynthesis. They can be found inside the seed.
The number of cotyledons varies among plant species and is a key characteristic used in plant classification. Plants with one cotyledon are called monocots, and those with two cotyledons are called dicots.

The other options mentioned are different parts or structures of a plant:

Endosperm is a tissue within the seed that provides nutrients to the developing embryo.
Sepals are leaf-like structures that protect the developing flower bud.
Tendrils are specialized structures used by some plants for support or attachment to other surfaces, such as for climbing.

Therefore, the correct answer is option a.

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Professor Tan studies water quality in streams near chemical plants. Which is a type of qualitative data that Professor Tanshould record during these studies?
the pH of the water
O any occurrences of unusual odors
O the oxygen concentration of the water
any changes in sizes of fish population

Answers

Answer:

Explanation:

Took the quiz

Final answer:

The occurrences of unusual odors in the water is considered as qualitative data in Professor Tan's studies. This is because such observations describe a quality of the water, not a quantity or measurable characteristic.

Explanation:

Qualitative data refers to non-numerical information. While studying the quality of water near chemical plants, Professor Tan might record several types of data. However, among the options presented, any occurrences of unusual odors in the water would be classified as qualitative data.

Indeed, experiences of our five senses like smell, color, and taste can be considered qualitative because they describe the quality of something rather than a quantity. So, in the case of Professor Tan's studies, if he noticed a strange smell in the water and recorded this observation, that would be classified as qualitative data.

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Which of the following lists the order of taxonomic levels from the largest to the smallest group?

Answers

class, family, order, domain, kingdom, phylum, genus, species

Answer:

domain, kingdom, phylum, class, order, family, genus, species

Explanation:

True or False: sow bugs are insects

Answers

Answer:

False

Explanation:

Both Pillbugs and Sowbugs are not insects or true bugs. They're soil-dwelling crustaceans, like an Isopoda.

Explain the connection between the oxidation of water in photosystem II of the light-dependent reactions and the synthesis of glyceraldehyde-3-phosphate in the light-independent reactions.

Answers

Answer:

Please find the explanation below

Explanation:

This question is describing the processes involved in photosynthesis. In the light-dependent stage of photosynthesis, specifically photosystem II (PSII), water is oxidized in a process called PHOTOLYSIS OF WATER. This process produces electrons and Hydrogen ions (H+). The electrons produced via this process is accepted by NAD+ to yield NADH.

The NADH is an electron carrier produced during the light-dependent stage and used to reduce 3-phsophoglycerate (PGA) produced in the light-independent stage to glyceraldehyde-3-phosphate (G3P).

Final answer:

The oxidation of water in photosystem II of the light-dependent reactions is connected to the synthesis of glyceraldehyde-3-phosphate in the light-independent reactions.

Explanation:

In photosynthesis, the oxidation of water in photosystem II of the light-dependent reactions is connected to the synthesis of glyceraldehyde-3-phosphate in the light-independent reactions. In the light-dependent reactions, photons of light strike photosystem II and excite electrons, which then pass through an electron transport chain, leading to the production of ATP and NADPH. The ATP and NADPH generated in the light-dependent reactions are then used in the Calvin cycle to power the synthesis of glyceraldehyde-3-phosphate from CO₂.