Which of the following concepts is not an evidence of the particles nature of matter?
A solid cube of side 50cm and mass 75kg floats in a liquid with \(\frac{1}{3}\) of its height above the liquid surface. The relative density of the liquid is?
A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill?
Which of the following is an essential physical property of the wires uses for making fuses ?
A 40W instrument has a resistance 90 Ohms. On what voltage should it be operated normally
