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Q.52. Which of the following statement(s) is/are true ? (A) If two orbitals have the same value of (n + l), the orbital with lower value of n will have lower energy. (B) Energies of the orbitals in the same subshell increase with increase in atomic number. (C) The size of 2p, orbital is less than the size of 3p orbital. (D) Among 5f,6s, 4d, 5p and 5d orbitals, none of the orbitals have 2 radial nodes. Choose the correct answer from the options given below:

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A metal wire of uniform mass density having length L and mass M is bent to form a semicircular arc and a particle of mass m is placed at the centre of the arc. The gravitational force on the particle by the wire is: [Diagram: Semicircular arc with mass m at center]

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