1
JEE Main 2023 (Online) 31st January Evening Shift
Numerical
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If the binding energy of ground state electron in a hydrogen atom is $13.6\, \mathrm{eV}$, then, the energy required to remove the electron from the second excited state of $\mathrm{Li}^{2+}$ will be : $x \times 10^{-1} \mathrm{eV}$. The value of $x$ is ________.

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2
JEE Main 2023 (Online) 31st January Morning Shift
Numerical
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For hydrogen atom, $$\lambda_{1}$$ and $$\lambda_{2}$$ are the wavelengths corresponding to the transitions 1 and 2 respectively as shown in figure. The ratio of $$\lambda_{1}$$ and $$\lambda_{2}$$ is $$\frac{x}{32}$$. The value of $$x$$ is __________.

JEE Main 2023 (Online) 31st January Morning Shift Physics - Atoms and Nuclei Question 38 English

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3
JEE Main 2023 (Online) 30th January Evening Shift
Numerical
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Out of Syllabus
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A radioactive nucleus decays by two different process. The half life of the first process is 5 minutes and that of the second process is $30 \mathrm{~s}$. The effective half-life of the nucleus is calculated to be $\frac{\alpha}{11} \mathrm{~s}$. The value of $\alpha$ is __________.

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4
JEE Main 2023 (Online) 29th January Morning Shift
Numerical
+4
-1
Out of Syllabus

A radioactive element $$_{92}^{242}$$X emits two $$\alpha$$-particles, one electron and two positrons. The product nucleus is represented by $$_{\mathrm{P}}^{234}$$Y. The value of P is __________.

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