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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.

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Uranium-235 has a half life of?

The half-life is 700 million years !


How far is the Andromeda?

Andromeda Galaxy is 2.52±0.14 million light-years from Earth.


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.


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.


What starts a black hole?

it simply starts when a star collapses

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Uranium-235 has a half life of?

The half-life is 700 million years !


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Housing starts in 2002 stood at 1.71 million


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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?

There will be 125 atoms of Na24 remaining in the sample after 45 hours. This calculation is based on the fact that after 3 half-lives (45 hours/15 hours per half-life), the original 1000 atoms would have reduced by a factor of 2 three times, resulting in 1000/2/2/2 = 125 atoms remaining.


What African Country has a population of 9 million and starts with C?

Chad is the country which has 9 million population and one of the Africas country


What starts with p and ends with e and has million letters in it?

There is no such word


What starts with a P and ends with E and has a million letters in it?

There is no such word


When does the NAB league starts?

never...not once in a million years


How did housing starts fare in the early 2000s?

Housing starts increased from 1.2 million in 2000 to an estimated 1.6 million in 2003. Growth in the industry is expected to level off after 2003.


What starts with a P ends with an E and has a million letters?

post office


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What happened to housing starts in the 1970s?

although single-family housing starts dropped by 50 percent in 1966 to about 800,000, they peaked in 1972 at about 1.3 million. After falling to approximately 850,000 in 1975, housing starts rose to more than 1.4 million in 1977.