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A uranium235 sample starts with 200 atoms and 700 million years later there are 100 atoms What is the halflife of uranium235?
Wiki User
∙ 14y ago
700 milliion years. The definition of half-life is the period of time during which one-half of the atoms of an element undergo decay into other elements.
Wiki User
∙ 14y ago
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Uranium-235 has a half life of?
The half-life is 700 million years !
Why should the endpoint be taken as the faint pink color of the indicator?
When using an indicator in a titration, the color changes happen when the titrant has reacted with all the substance of interest in the sample. As soon as the titrant isn't reacting with the sample any more, it starts reacting with the indicator, and continuing past the first hint of color will be using too much titrant, and the calculations for the concentration of the sample will be wrong. Phenolphthalein starts out pink, but will turn red as the pH keeps changing as you go further past the endpoint of the titration.
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How long does it take for light and sound to reach earth?
The length of time it takes light to reach earth has a lot to do with where it starts out from. If it starts from the moon, it takes about 1.5 seconds. If it starts from the sun, it takes about 8 and 1/3 minutes. If it starts from the nearest star, it takes about 4.4 years. If it starts from the North Star, it takes about 230 years. If it starts from the Andromeda Galaxy, it takes about 2.5 million years. Sound can't reach the earth from any other body. Sound needs air to travel through, and there's no air past a couple hundred miles above earth's surface. Sound can't even travel between two astronauts standing on the moon 2-ft apart.
The halflife of Na24 is 15 hours When there are 1000 atoms of Na24 in a sample a scientist starts a stopwatch The scientist stops the stopwatch at 45 hours there are atoms of Na24 rema?
125
Uranium-235 has a half life of?
The half-life is 700 million years !
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What starts with p and ends with e and has million letters in it?
There is no such word
When does the NAB league starts?
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What starts with a P and ends with E and has a million letters in it?
There is no such word
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What starts with a P ends with an E and has a million letters?
post office
What starts with P and ends with E and has a million letters in it?
There is no such word
What happened to housing starts in the 1970s?
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In 1998 housing starts matched the 1996 number of 1.45 million, down slightly from the previous year. By 2002, however, housing starts had reached 1.70 million, 1.36 million of which were single-family
