This is easy to do when you're trying to figure out what half of a given number will be. Answer and Explanation: If you want to divide any number by 2 in your head, without having to write down the problem, the first thing to do is to look at the number in the...

Nov 21, 2023 · The 45-45-90 triangle is exactly half of a perfect square. Properties and Rules of 45-45-90 Triangles. The rules about the properties of the 45-45-90 triangle are as follows: 1. One angle must ...

Finding Half of a Number. To find out what half of a number is simply divide that number by 2. If the number is an even number, the answer will be a whole number.

Half-life decay: Since it takes one half-life for an half of a material to decay, it is a common misconception that all of the material will decay after two half lives, but after a second half-life, only three-quarters have decayed. This is because half of the remaining material decays after another half-life not half of the initial material.

If radon-222 has a half-life of 3.8 days, determine how long it takes for only 1 / 8 of a sample to remain. How much of a 24-gram sample of Radium-226 will remain unchanged at the end of three half-life periods? A radioactive sample contains 2.45 g of an isotope with a half life of 3.8 days. How much of the isotope in grams remains after 11.4 days?

A radioactive sample contains 2.45 g of an isotope with a half life of 3.8 days. How much of the isotope in grams remains after 11.4 days? Strontium-90 has a half life of 28.1 yrs. Starting with 3.20 mg of this isotope, how much would remain after 112.4 years?

A radioactive sample contains 2.45 g of an isotope with a half life of 3.8 days. How much of the isotope in grams remains after 11.4 days? In a sample of radioactive material, what fraction of the initial number of active nuclei will remain undisintegrated after half of a half life of the sample?

A reaction is first order in A. If the rate constant of the reaction is 3.45 times 10^{-3} s^{-1}, what is the half life of the reaction? A first-order reaction is 75% complete in 65 seconds. For this process, determine: a. the value and units of the rate constant b. the half-life for this reaction

A pure sample of a radioactive isotope weighing 156 mg and with a half-life of 128 days is allowed to decay for one year. Approximately how much of the isotope remains? A radioactive sample contains 2.45 g of an isotope with a half life of 3.8 days. How much of the isotope in grams remains after 11.4 days?

Calcium-45 has a half-life of 165 days. How much of a 40-mg sample would remain after 4 half-lives? Technetium-99m has a half-life of 6.01 hours. If a patient injected with technetium-99m is safe to leave the hospital once 72.0% of the dose has decayed, how many hours after the injection is the patient allowed to leave?