1 Answers
Call
Talk Doctor Online in Bissoy App
Different radioisotopes have different half-lives. For example, the half-life of carbon-14 is 5,700 years, the half-life of uranium- 235 is 704 million years, the half-life of potassium- 40 is 1.3 billion years, and the half-life of rubidium-87 is 49 billion years. a. Why wouldn't you use an isotope with a half-life similar to that of carbon-14 to determine the age of the Solar System? b. The age of the universe is approximately 14 billion years. Does that mean that no rubidium- 87 has decayed yet?
a. You wouldn't use an isotope with a half-life similar to that of carbon-14 to determine the age of the Solar System because the timescale involved in the formation of...
1 Answers 1 views
Suppose you have an element with a Radioactivity of 175 Rad. What will be the resulting Radioactivity if it undergoes its a)1st half-life? b)2nd half-life? and c)5th half-life? with solution
a) 87.5 Radb) 43.75 Radc) 5.46 Rad
1 Answers 1 views
assume a bottle of wine consist of an 11% solution (by weight) of ethanol in water. if the bottle of wine is chilled to -20 degree celsius will the solution begin to freeze ?
11/100×-20=-2.2=-20+-2.2=-22.2°C
1 Answers 1 views
Normal water contain isotope of hydrogen H3 tritium. It has a half life of 12.è years.Determine the age of a bottle of wine whose H3 radiation is about 1/10 that present in new wine.
Half-time T = 12.3 years. The age of a bottle t: T = - tln2/ln∆N -tln2 = Tln∆N t = Tln∆N/-ln2 = 12.3•ln(0,1)/-ln2 = 12.3•(-2.3) / -0.693 =40.82 years
1 Answers 1 views
An isotope of caesium (caesium-137) has a half-life of 30 years. If 1.0 g of caesium-137 disintegrates over a period of 90 years, how many g of caesium- 137 would remain?
First, let's find out which amount of isotope is left after 90 years. Let M be the initial amount, then amount left after n years, given that half-life is T,...
1 Answers 1 views
How much time will be required for a sample of H-3 to lose 75% of its radioactivity? The half-life of tritium is 12.26 years.?
Solution:Tritium = H-3The half-life (t1/2) of tritium is 12.26 years.From law of radioactive decay: t1/2 = ln(2) / λwhere λ = decay constantλ = ln(2) / t1/2λ = (0.693) /...
1 Answers 1 views
The mass of a sample bottle is 27.23g. When filled with water, the bottle weighs 46.85g. The density of water is known to be 0.9976 g/mL. Calculate the capacity (volume) of the bottle.
(bоt.) = 27.23 g m( bоt. + H2O) =46.85g ρ(H2O) = 0.9976 g/ ml V(bоt.) - ? V(bоt.) = V(H2O) V(H2O) = m(H2O)/ ρ(H2O) =( m( bоt. + H2O) -...
1 Answers 1 views
Suppose you have an element with a Radioactivity of 175 Rad. What will be the resulting
Radioactivity if it undergoes its a)1 st half-life? b)2 nd half-life? and c)5 th half-life?
The radioactivity changes according to this equasion: A=A0/2n; A0 - initial radioactivity;A - radioactivity after it undergoes n half-life decaya) A=175/2=87.5 Rad;b)A=175/22=175/4=43.75 Rad;c)A=175/25=175/32=5.47 Rad;
1 Answers 1 views
Suppose you have an element with a Radioactivity of 175 Rad. What will be the resulting
Radioactivity if it undergoes its a)1st half-life? b)2nd half-life? and c)5th half-life?
a) 87.5 Radb) 43.75 Radc) 5.46 Rad
1 Answers 1 views
Suppose you have an element with a Radioactivity of 175 Rad. What will be the resulting Radioactivity if it undergoes its a)1st half-life? b)2nd half-life? and c)5th half-life?
a) 87.5 Radb) 43.75 Radc) 5.46 Rad
1 Answers 1 views