A nitrogen nucleus bombarded with an alpha particle produces an oxygen nucleus and a proton. The nuclear reaction for this process is \(^4_2H + ^{14}_2N \to ^{17}_{8}O + ^1_1H + Q\). Which of the following statements about the reaction is not correct?
the bombardment results into a nucleus with greater proton number
it is an induced nuclear reaction
it is a natural radioactive decay
the sum of the final nucleon numbers
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The ansa is c becuz artificial radioactivity occur when the elements atomic number is less than 82
Seeing the equation above,the elements atomic number is less than 82,so C is the right answer.
The increase in length of a material due to temperature change is given by:
ΔL = α L ΔT
where ΔL is the change in length, α is the coefficient of linear expansion, L is the original length, and ΔT is the temperature change.
In this case, the original length is 3m, the coefficient of linear expansion is 1 x 10^(-5) K^(-1), and the temperature change is 12°C (from 28°C to 40°C).
So, the change in length of one steel bar is:
ΔL = (1 x 10^(-5) K^(-1)) (3m) (12°C) = 0.00036m = 0.36cm
To avoid buckling or other issues, a safety gap should be left between the successive bars. This gap should be at least the amount of the change in length, which is 0.36cm.
Therefore, the answer is D. 3.6x10^(-1) cm.
