AP EAPCET 2024 - 18th May Morning Shift | Atoms and Nuclei Question 19 | Physics

A mixture consists of two radioactive materials $A_1$ and $A_2$ with half lives of 20 s and 10 s respectively. Initially, the mixture has 40 g of $A_1$ and 160 g of $A_2$. The amount of the two in the mixture will become equal after

60 s

80 B

20 s

408

AP EAPCET 2022 - 5th July Morning Shift

MCQ (Single Correct Answer)

-0

An electron in the hydrogen atom excites from 2nd orbit to 4th orbit then the change in angular momentum of the electron is (Planck's constant $$h=6.64 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$)

$$2.11 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$

$$1.05 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$

$$0.57 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$

$$422 \times 10^{-34} \mathrm{~J}-\mathrm{s}$$

AP EAPCET 2022 - 5th July Morning Shift

MCQ (Single Correct Answer)

-0

Choose the correct statement of the following

The nuclear density in general, is independent of mass number A.

The radius of nucleus is directly proportional to the mass number of A of the nucleus.

The binding energy of a nucleus is inversely proportional to its mass defect.

Energy is observed when heavy nuclei undergo transmutation into light nuclei.

AP EAPCET 2022 - 5th July Morning Shift

MCQ (Single Correct Answer)

-0

A ancient discovery found a sample, where $$75 \%$$ of the original carbon ($$\mathrm{C}^{14}$$) remains. Then the age of the sample is $$\binom{T_{\frac{1}{2}}\left(C^{14}\right)=5730 \text { years, } \ln 0.5=-0.7}{\ln (0.75)=-0.3} $$

2300 years

2456 years

2546 years

3456 years

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