Physics Past Questions and Answers

Radio waves have a velocity of \(3 \times 10^{8} \mathrm{~m} / \mathrm{s}\). A radio station sends out a broadcast on a frequency of \(800 \mathrm{KHz}\). The wavelength of the broadcast is ____________

A narrow beam of white light ca be split up into different colours by a glass prism. The correct explanation is that ____________

Two forces whose resultant is \(100 \mathrm{~N}\), are at right angles to each other. If one of them makes an angle of \(30^{\circ}\) with the resultant, determine its magnitude.

A conductor of length \(2 \mathrm{~m}\) carries a current of \(0.8\) A while kept in magnetic field of magnetic flux density \(0.5 \mathrm{~T}\). The maximum force acting on it is ____________

A heavy object is suspended from a string and lowered into water so that is completely submerged. The object appears lighter because ____________