aleenaabbas1
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Could anyone help me out with these questions?

1) A teacher has two radioactive sources, A and B.
Source A has a longer half-life than source B.
What can be deduced about the nuclei in source A compared with the nuclei in source B?
Do not refer to isotopes in your answer.

2)A student rolled 144 dice and removed all those that landed on the number 6.
The student rolled the remaining dice and again removed all those that landed on number 6.
When the student had rolled the dice 20 times there were 9 dice left.
Calculate the most likely number of times that the student had rolled the dice before the number of dice halved.

3)The initial temperature of a mixture was +20 degrees. The mixture froze at -1.5 degrees.
A total of 165 KJ of internal energy was transferred from the mixture to cool and freeze it.
specific latent heat= 3500 J/KJ degrees
specific latent heat of fusion of the mixture=255 000 J/Kg
Calculate the mass of the mixture.
Give your answer to 2 s.f
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Eimmanuel
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Report 5 months ago
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(Original post by aleenaabbas1)
Could anyone help me out with these questions?

1) A teacher has two radioactive sources, A and B.
Source A has a longer half-life than source B.
What can be deduced about the nuclei in source A compared with the nuclei in source B?
Do not refer to isotopes in your answer.

2)A student rolled 144 dice and removed all those that landed on the number 6.
The student rolled the remaining dice and again removed all those that landed on number 6.
When the student had rolled the dice 20 times there were 9 dice left.
Calculate the most likely number of times that the student had rolled the dice before the number of dice halved.

3)The initial temperature of a mixture was +20 degrees. The mixture froze at -1.5 degrees.
A total of 165 KJ of internal energy was transferred from the mixture to cool and freeze it.
specific latent heat= 3500 J/KJ degrees
specific latent heat of fusion of the mixture=255 000 J/Kg
Calculate the mass of the mixture.
Give your answer to 2 s.f
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A_benaissa
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Report 1 month ago
#3
(Original post by aleenaabbas1)
Could anyone help me out with these questions?

1) A teacher has two radioactive sources, A and B.
Source A has a longer half-life than source B.
What can be deduced about the nuclei in source A compared with the nuclei in source B?
Do not refer to isotopes in your answer.

2)A student rolled 144 dice and removed all those that landed on the number 6.
The student rolled the remaining dice and again removed all those that landed on number 6.
When the student had rolled the dice 20 times there were 9 dice left.
Calculate the most likely number of times that the student had rolled the dice before the number of dice halved.

3)The initial temperature of a mixture was +20 degrees. The mixture froze at -1.5 degrees.
A total of 165 KJ of internal energy was transferred from the mixture to cool and freeze it.
specific latent heat= 3500 J/KJ degrees
specific latent heat of fusion of the mixture=255 000 J/Kg
Calculate the mass of the mixture.
Give your answer to 2 s.f
hey do you have the answers to the paper i really need them!
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