Three sound waves of equal amplitudes have frequencies (v−1),v,(v+1). They superpose to give beats. The number of beats produced per second will be
Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is
Knowing that the Chemsitry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements in incorrect ?
Consider a family of circles which are passing through the point (−1,1)and are tangent to x-axis. If (h, k) are the co-ordinates of the centre of the circles, then the set of values of k is given by the interval