i and ii only
ii and iii only
i and iii only
i, ii, and iii only
Correct answer is A
No explanation has been provided for this answer.
4Mp > Mx
4Mp = Mx
4Mp < Mx
Mp > Mx
Correct answer is A
Energy is given out
1\(\frac{1}{4}\) days
8\(\frac{1}{4}\) days
30 days
80 days
Correct answer is C
half-life = 10 days
after 10 days, the 4g of element = 2g remaining with 2g disintegrated
after 10 days, 2g of element = 1g left with 1g disintegrated
hence, after 20 days, 3g of the element has been disintegrated with 1g left.
after 10 days, the 1g of element = 0.5g left with 0.5g disintegrated
after 30 days, we have 0.5g of element left with 3.5g disintegrated.
When an atom loses or gains a charge, it becomes
an electron
an ion
a neutron
a proton
Correct answer is B
No explanation has been provided for this answer.
i and ii only
i and iii only
ii and iii only
i, ii, and iii
Correct answer is B
No explanation has been provided for this answer.