Class 9 Physics Sound Notes for CBSE Chapter 12
The disturbance is handed over from one particle to another particle of the medium without the actual movement of the particles of the medium.
The disturbance is handed over from one particle to another particle of the medium without the actual movement of the particles of the medium.
Fluid is a substance that flows under the action of an applied force and does not have a shape of its own. For example, liquids and gases. They take the shape of the container in which they are stored.
Energy governs all the activities on this planet. It has a vast range of applications-biological, physical, metaphysical, agricultural, industrial, transportational and so on.
Energy released, when some changes take place in the nucleus of an atom of a substance, is called nuclear energy.
Magnet was first discovered some 5,000 years ago in Magnesia. It could attract small pieces of iron towards it and had directional property i.e.
Electricity has made our life comfortable and easy. We depend on the electricity for almost all our activities.
Besides developing the three laws of motion, Sir Issac Newton also examined the motion of the heavenly bodies – the planets and the moon.
INTRODUCTION In everyday language, the word work is used to …
The phenomenon of the change in the path of the light as it passes from one transparent medium to another is called Refraction of light.
A force cannot be seen. A force can be judged only by the effects which it can produce in various bodies (or objects) around us.