3; REVIEWS: If the ratio of argon to potassium atoms is 7:1, three half-lives have elapsed.
<h3>Do potassium's half-lives last a long time?</h3>
For potassium atoms, the image result is 7:1, meaning three half-lives have passed. details
A radioactive potassium isotope with a long half-life of 1.25 billion years is known as potassium-40 (40K). About 0.012% (120 ppm) of the total potassium present in nature is contained in it.
<h3>How much of a sample is still there after three half-lives?</h3>
One eighth (12.5%) of the initial sample is still present after three half-lives. The period of time needed for one-half of a sample to traverse through...
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Conditions that result in an increase in acidity are:
- 1M H- Adding to a solution
- Lowering the pH level
Conditions that result in a decrease in acidity are:
- Firstly, add a solution with 1M (-OH)
- Taking out the H-
- Adding a Base
<h3>What is an acid?</h3>
Generally, an acid is a liquid having certain chemical characteristics, such as the ability to make litmus red, neutralize alkalis, and dissolve certain metals.
In conclusion, The acidity of a solution varies as its poh value varies across the table.
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Answer: uranium
Explanation: It’s hard to find when mining and is required for nuclear fission
Answer:
Human ears can hear sound waves that vibrate in the range from about 20 times a second (a deep rumbling noise) to about 20,000 times a second (a high-pitched whistling). (Children can generally hear higher-pitched sounds than their parents, because our ability to hear high frequencies gets worse as we get older.) Speaking more scientifically, we could say that the sounds we can perceive have a frequency ranging from 20–20,000 hertz (Hz). A hertz is a measurement of how often something vibrates and 1 Hz is equal to one vibration each second. The human voice makes sounds ranging from a few hundred hertz to a few thousand hertz.
Suppose you could somehow hit a drum-skin so often that it vibrated more than 20,000 times per second. You might be able to see the skin vibrating (just), but you certainly couldn't hear it. No matter how hard you hit the drum, you wouldn't hear a sound. The drum would still be transmitting sound waves, but your ears wouldn't be able to recognize them. Bats, dogs, dolphins, and moths might well hear them, however. Sounds this like, with frequencies beyond the range of human hearing, are examples of ultrasound.
Infrasonics, vibrational or stress waves in elastic media, having a frequency below those of sound waves that can be detected by the human ear—i.e., below 20 hertz. The range of frequencies extends down to geologic vibrations that complete one cycle in 100 seconds or longer.
