Physics, 29.08.2019 15:00 ava4460

The curies took pure uranium and a uranium-containing substance. when they measured the amount of radioactivity, there was more in the uranium-containing substance than the pure uranium. which idea did the curies most likely develop?

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Answer from: layshascott

She developed the idea that there were more radioactive substances than uranium.

Explanation:

In the given problem, the Curies took pure uranium and a uranium-containing substance. When they measured the amount of radioactivity, there was more in the uranium-containing substance than the pure uranium.

She extracted uranium from an ore. She surprised to find that the leftover ore showed more activity than pure uranium. The ore contained other radioactive elements.

She likely to develop the idea that there were more radioactive substances than uranium.

Answer from: edith47

She developed the idea that there were more radioactive substances than uranium.

Explanation:

Hope this helps!!

Answer from: Quest

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

$_a^z\textrm{x}\rightarrow _{a-2}^{z-4}+_2^4\alpha$

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

$_a^z\textrm{x}+_{-1}^0\textrm{e}\rightarrow _{z-1}^a\textrm{y}$

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases $\gamma -radiations$ . this process does not change the mass number.

$_a^z\textrm{x}^*\rightarrow _a^z\textrm{x}+_0^0\gamma$

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as $\beta ^+$ -decay. in this the mass number remains same.

$_a^z\textrm{x}\rightarrow _{z-1}^a\textrm{y}+_{+1}^0e$

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

Answer from: Quest

explanation:

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