Values of work function (Wo) for a few metals are given below Metal Li Na K Mg Cu Ag Wo/eV 2.42 2.3 2.25 3.7 4.8 4.3 The number of metals which will show photoelectric effect when light of wavelength 400nm falls on it is____ Given: h = 6.6 × 10-34 J s c = 3 x 108 m s-1 e = 1.6 x 10-19 C

A force of 49 N acts tangentially at the highest point of a sphere (solid of mass 20 kg) kept on a rough horizontal plane. If the sphere rolls without slipping, then the acceleration of the center of the sphere is:

JEE Main - 2025
Quantum Mechanics

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Let a circle C pass through the points (4, 2) and (0, 2), and its centre lie on \(3x + 2y + 2 = 0\). Then the length of the chord of the circle C, whose midpoint is (1, 2), is:

JEE Main - 2025
Coordinate Geometry

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A square loop of sides \( a = 1 \, {m} \) is held normally in front of a point charge \( q = 1 \, {C} \). The flux of the electric field through the shaded region is \( \frac{5}{p} \times \frac{1}{\varepsilon_0} \, {Nm}^2/{C} \), where the value of \( p \) is:
A square loop of sides a=1mis held normally