AIEEE 2003 | Atoms and Nuclei Question 289 | Physics

A radioactive sample at any instant has its disintegration rate $$5000$$ disintegrations per minute. After $$5$$ minutes, the rate is $$1250$$ disintegrations per minute. Then, the decay constant (per minute) is

$$0.4$$ $$ln2$$

$$0.2$$ $$ln2$$

$$0.1$$ $$ln2$$

$$0.8$$ $$ln2$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

If the binding energy of the electron in a hydrogen atom is $$13.6eV,$$ the energy required to remove the electron from the first excited state of $$L{i^{ + + }}$$ is

$$30.6$$ $$eV$$

$$13.6$$ $$eV$$

$$3.4$$ $$eV$$

$$122.4$$ $$eV$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

Which of the following atoms has the lowest ionization potential ?

$${}_7^{14}N$$

$${}_{55}^{133}\,Cs$$

$${}_{18}^{40}\,Ar$$

$${}_8^{16}\,O$$