Why the numbers of alpha particles are emitted
Radium-226, which undergoes the alpha decay, has a half-life of 1600yr. 1. Determine the numbers of alpha particles are emitted in the 1.9 min by a 6.3-mg sample of 226Ra? 2. Determine the activity of the sample in Ci?
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One plane flies 25mph faster than other. Determine airspeed of each plane if cities are 275 miles apart and planes pass each other after 40 minutes of flying time.
Determine the emf under actual operating conditions when the partial pressure of the oxygen is 0.21 atm.
Suppose the temperature is 25degrees Celsius and a partial pressure of oxygen is the 0.21 atm. If a current of 2.1 * 10^5 A is to be drawn from a zinc-air system, what volume of the air would require to be supplied to the battery every second?
In a study of length of time that studnets need to earn bachelor degrees, 80 students ar erandomly selected adn they are found to have a mean of 4.8 years an standard deviation of 2.2 years. Develop a 95% confidence interval for population mean ti
Radium-226, which undergoes the alpha decay, has a half-life of 1600yr. Determine the numbers of alpha particles are emitted in the 1.9 min by a 6.3-mg sample of 226Ra?
A gaseous compound containing hydrogen and carbon was analyzed and found to consist of the 83.65% carbon by mass. At 139 degrees C and 1.00 atm, when the density of this compound is 2.55g/L then how can find the molar mass of the compunds?
Randomly chose statistics students of mr johnson partcipcated in experiment to test their capabilltiy to estimate when 1min or 60 second has passed. 40 students yielded sample mean of 58.3 sec as well as a stnadard devaition of 9.5 sec. at the 5%
Estimate the heat of formation of sucrose, knowing that the heat of combustion is -5645 KJ/mol. How can write the equation for the combustion of sucrose?
From production line of manufatoring process 400 items are inspected after random selection. It was found that 28 of the items were defective. It is assumed that 10% of the items are defective.
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