jee_main_2026_23_january_evening - Structure of Atom Topics

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QUESTION #64 Planck's Quantum Theory and Photoelectric Effect
Identify the INCORRECT statements from the following: A. Notation ²⁴₁₂Mg represents 24 protons and 12 neutrons. B. Wavelength of a radiation of frequency 4.5 × 10¹⁵ s⁻¹ is 6.7 × 10⁻⁸ m. C. One radiation has wavelength = λ₁(900 nm) and energy = E₁. Other radiation has wavelength = λ₂(300 nm) and energy = E₂. E₁ : E₂ = 3 : 1. D. Number of photons of light of wavelength 2000 pm that provides 1 J of energy is 1.006 × 10¹⁶. Choose the correct answer from the options given below:
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QUESTION #68 Photoelectric Effect
The work functions of two metals (MA and MB) are in the 1:2 ratio. When these metals are exposed to photons of energy 6 eV, the kinetic energy of liberated electrons of MA:MB is in the ratio of 2.642:1. The work functions (in eV) of MA and MB are respectively.
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Rankbit System
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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