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?1,620 years

3,240 years

4,860 years

6,480 years

Answers

Answer 1

Answer: Using the formula:
elapsed time = half life * log (beginning amount / ending amount) / log 2
= 1620*log(1/0.125)/log2
=1436/0.30
=4786.66

So the closest answer would be 4860 Years

Answer 2

Answer:

your answer would be C because after 0 half lives 1 kg after 1 half life 0.5 kg after 2 half lives 0.25 kg after 3 half lives 0.125 kg so that is three half lives , or 3 times 1,620 years = 4860 years

hope i helped

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Identify two spiders in united states whose bites are most poisonous

Answers

The two spiders in United States that are poisonous: Black widow (southern and western) prefer staying hidden in sheds, garages or piles of debris. The female's bite is most dangerous. The venom of these spiders is very potent.
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how is the expression of sex linked genes both similar to and different from the expression of autosomal genes?

Answers

Sex chromosomes contain genes that determine the sex of a person. Two X chromosomes result in a female and one X plus a Y result in a male.

In those chromosomes, there are genes specific for each gender, and in those chromosomes, there are genes that code for certain traits- the sex-linked traits.
These traits will be inherited according to the sex chromosomes they receive from their parents. Women recieve one X from the mother and the other from the father while men recievethe X from the mother and the Y from the father).

This will cause a difference in the expression of genes because women can become carriers of a certain disease while men either manifest it or don't (there are no carriers since the X chromossome is different than the Y)

In autosomal genes, the expression doesn't depend on the gender since the autosomal chromosomes contain genes that code for the same trait, and so the expression on autosomal genes in men and women are similar.

first of all you are already known about the genes found in male and female Autosomal genes are not expressed by the X or Y chromosome. Sex linked genes are expressed by the X or Y chromosome. Expression of autosomal and sex-linked genes are the same in that both require undergo meiosis and crossing-over may occur and transcription and translation of genes are required.

1. Scientists believe that ancient ancestors of all animals were (1 point) A) single-celled prokaryotes that reproduced asexually. B) single-celled eukaryotes that sometimes grew in colonies. C) multicellular organisms that were probably autotrophic. D) multicellular organisms with an alternation of generations lifecycle. 2. The Cambrian Explosion resulted in the evolution of the first (1 point) A) dinosaurs and mammals. B) representatives of most animal phyla. C) bacteria. D) land animals.

Answers

Scientists believe that ancient ancestors of all animals were single celled eukaryotes that sometimes grew in colonies. The correct option among all the options that are given in the question is the second option or option "B".

The Cambrian Explosion resulted in the evolution of the first representatives of most animal phyla. The correct option among all the options that are given in the question is option "B".

1. The correct answer is option B, single-celled eukaryotes that sometimes grew in colonies

Reason – Single celled species are originally the main ancestors of all animals because after evolution and classification, these species evolved into multicellular organisms which later on further diversified into different generas, species and classes. Living in colonies allowed these single celled species to produce sexually

2. The correct answer is option B, representatives of most animal phyla

Reason – The cambarian explosion is considered as the most evolutionary phase in the Earth’s history. All major animal body plans including Ctenophora, Poriferas, Cindaria, Chordata, Hemichordata, Echinodermata, Nematoda, Artropoda, Platyhelminthes, Mollusca, Annelida, Brachiopoda etc. occurred during this period.

What is the probability of a homozygous recessive individual (ss) producing a gamete with a dominant allel (S)?

Answers

0% (0/4) is the probability of a homozygous recessive individual (ss) producing a gamete with a dominant allel (S).

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The probability that a homozygous recessive individual would be producing a dominant allele would be 0%. If expressed as a percentage, this is because the individual does not even have the possible allele in its genotype for whatever trait or feature that the protein codes for.

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Answers

True because of p=mv

Answer:

It is possible for the momentum of an object to change. If the velocity vector of an object's momentum changes, the momentum of the object changes. TRUE

Explanation:

True or false are acts like a blanket that keeps the earth warm