Atoms

Subject matter experts of JagranJosh have developed chapter wise practice questions of Class 12th as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Atoms” of Physics.

  • Q1.The energy level for an electron in a certain atom is shown in the figure given below. Which of the transition shown in the figure represents the emission of a photon with maximum energy?

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  • Q2.The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultra = violet radiation. Infrared radiation will be obtained in the transition from.

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  • Q3.The total energy of electron in the ground state of hydrogen atom is – 13.6 e V. What is the K.E. of this electron in first excited state?

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  • Q4. The energy of an electron in nth orbit of hydrogen atom is  13.6/ n 2 eV. Energy required to  excite thee electron from the first orbit to the third orbit is

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  • Q5. Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelength  λ 1 : λ 2  emitted in the two cases is

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  • Q6.The impact parameter b, for scattering of α particles by 180° is

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  • Q7.Which level of the doubly ionized lithium has the same energy as the ground state energy of the hydrogen atom?

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