MHT CET 2026 19th April Morning Shift | Atoms and Nuclei Question 10 | Physics

The shortest wavelength in the Balmer series of hydrogen atom is equal to the shortest wavelength in the Brackett series of a hydrogen like atom of atomic number 'Z'. The value of 'Z' is

$6$

$4$

$3$

$2$

MHT CET 2026 19th April Morning Shift

MCQ (Single Correct Answer)

-0

A radioactive sample has half-life of $5$ years. The percentage of fraction decayed in $10$ years will be

$25\%$

$50\%$

$75\%$

$90\%$

MHT CET 2025 5th May Evening Shift

MCQ (Single Correct Answer)

-0

A radioactive element having half-life 30 min . is undergoing beta decay. The fraction of radioactive element remains undecayed after 90 min . will be

$\frac{1}{2}$

$\frac{1}{4}$

$\frac{1}{8}$

$\frac{1}{16}$

MHT CET 2025 5th May Evening Shift

MCQ (Single Correct Answer)

-0

The ratio of the total energy of the $2^{\text {nd }}$ orbit electron for the hydrogen atom ($^1\mathrm{H}$) to that of a helium ion ($\mathrm{He}^+$) is :

$\frac{1}{2}$

$\frac{1}{4}$

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