The wavelength of ultraviolet radiation is 400nm. If the speed of light in air is 3 x 108ms-1, then the frequency of the ultraviolet radiation is

Fig 1 is a graph of force against extension for a spiral spring, the force constant of the spring is given by the

If the fig above E is an accumulator with negligible internal resistance. and the EMF 9.0V, The the total current is

A uniform meter rule QR is balanced on a knife edge which is 55cm from R, when a mass of 10g is hung at P as shown above, the mass of the meter rule is (Note...

In an experiment in which molten naphthalene is allowed to cool, the cooling curve in fig 5 was obtained, the temperature 80∘C 80 ∘ C is known as

In fig 3, three forces F1, F2, and F3 acting at O are in equilibrium. If the magnitude of F1 is 10N,and the magnitude of F2 is 5N, find the magnitude of F3

In fig 6, a ray of light in air strikes a glass plate at an angle of incidence 60 degrees, the reflected ray is observed to be perpendicular to the refracted...

In fig 9 the value of R is

Fig 4 represents a block-and-tackle pulley system on which an effort of W newtons supports a load of 120.0N if the efficiency of the system is 40% then the v...