A reflexive relation on a set A is a relation R where every element is related to itself. Mathematically, R is reflexive if (a, a) ∈ R for all a ∈ A. Example: On A = {1, 2}, R = ...
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The second excited state of hydrogen atom corresponds to n = 3 and as per Bohr’s model the angular momentum of electron is 3h/2pi. Class 12 Physics NCERT Sample Paper Question Session 2024-2025.
When an intrinsic semiconductor is doped with a trivalent impurity (say aluminium), an additional acceptor energy level is formed slightly above the top of the valence band. As a result energy gap is reduced to a large extent. Class 12 ...
When object is placed at focus of microscope lens, its magnified image is formed at infinity and magnifying power m = D/f = 25cm/5cm = 5. Class 12 Physics NCERT Sample Paper Question Session 2024-2025.
As object approaches a converging lens from infinity to its focus with a uniform speed, its image moves away from the lens. The image starts from focus and goes upto infinity. The image is real and inverted one. Class 12 ...