Energy of an electron is given by
Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be (h=6.62×10?34Jsandc=3.0×108ms?1)
A long cylindrical shell carries positive surface charge σ in the upper half and negative surface charge −σ in the lower half. The electric field lines around the cylinder will look like figure given in : (figure are schematic and not drawn to scale)
The set of all values of λfor which the system of linear equations : 2x1−2x2+x3=λx12x1−3x2+2x3=λx2−x1+2x2=λx3has a non-trivial solution,
The equation of the circle passing through the foci of the ellipse 16x2+9y2=1, and having centre at (0, 3) is
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?
Let a, b, c and d be non-zero numbers. If the point of intersection of the lines 4ax+2ay+c=0and 5bx+2by+d=0 lies in the fourth quadrant and is equidistant from the two axes then
Let AandB be two sets containing four and two elements respectively. Then the number of subsets of the set A×B, each having at least three elements is :