jee_main_2026_23_january_evening - Structure of Atom Topics

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Sample Questions in this Chapter

QUESTION #64 Planck's Quantum Theory and Photoelectric Effect
Identify the INCORRECT statements from the following: A. Notation ^24_12Mg represents 24 protons and 12 neutrons. B. Wavelength of a radiation of frequency 4.5 times 10^15 text s^-1 is 6.7 times 10^-8 text m. C. One radiation has wavelength = lambda_1(900 text nm) and energy = E_1. Other radiation has wavelength = lambda_2(300 text nm) and energy = E_2. E_1 : E_2 = 3 : 1. D. Number of photons of light of wavelength 2000 text pm that provides 1 text J of energy is 1.006 times 10^16. Choose the correct answer from the options given below:
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QUESTION #68 Photoelectric Effect
The work functions of two metals (M_A and M_B) are in the 1:2 ratio. When these metals are exposed to photons of energy 6 text eV, the kinetic energy of liberated electrons of M_A:M_B is in the ratio of 2.642:1. The work functions (in texteV) of M_A and M_B are respectively.
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JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)
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