A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is 'a', the closest approach between two atoms in metallic crystal will be:-
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Two stones are thrown up simultaneously from the edge of the cliff 240 m high with initial speed of 10 m/s and 40 m/s respectively. Which of the following graph best represents the time variation of relative position of the second stone with respect to the first ? (Assume stones do not rebound after hitting the ground and neglect air resistance, take g=10m/s2) (The figure are schematic and not drawn to scale)
What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 2R?
Let PS be the median of the triangle with vertices P(2,2),Q(6,−1)andR(7,3). The equation of the linepassing through (1,−1) and parallel to PS is
Diameter of plano-convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2×108m/s, the focal length of the lens is :
A multiple choice examination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answers just by guessing is
If [a×bb×cc×a]=λ[abc]2, then l is equal to
Which of the following exists as covalent crystals in the solid state?
The ionic radii (in Å) of N3−,O2− and F− are respectively :