the new physics

1) A physical change is temporary and is usually reversible. 2) No new substances are formed during a physical change. 3) There is no change in mass of the substance during a physical change. 4) There is no net absorption or release of energy during a..

A physical change is a temporary change in which no new substance is formed and the composition of the substance is not altered although certain specific physical properties may be changed. The following points may be noted with respect to physical chan..

Physical Change: When the shape, size, appearance or state, of a substance is altered, but its chemical composition remains same a physical change of matter takes place. No new substance is formed. It is usually a change, which is reversible, that is, by revers..

Physical Change: When the shape, size, appearance or state, of a substance is altered, but its chemical composition remains same a physical change of matter takes place. No new substance is formed. It is usually a change, which is reversible, that is, by reversing t..

. Thus it is a physical change. Now we can define a physical change: Physical change is a change in which only physical properties of a substance changes, no new substance is- formed and generally original substance can be easily recovered. Followin..

There are other branches of science too. Astronomy is the science which tries to understand the moon, the planets, the stars and the universe beyond the stars. It is built on the basis of physics. Meteorology is the physics of our atmosphere and it attempts to explain..

he value of a physical quantity is always equal to the multiple of numerical value and the unit. For example, mass of a piece of iron is 2.5 kg. Here, just writing 2.5 carries no meaning, but adding the term kg after 2.5 indicates its mass. In order that a measured or calculated quan..

a) Tearing of paper. b) Production of biogas c) Butter going rancid. d) Magnetisation of iron e) Clotting of blood. Answer: a) Physical - No change in mass. b) Chemical - New substances with new properties are produced. c) Chemical - New..

1) A rock rolls down a slope. 2) Baking of cake. 3) Plucking of fruit 4) Burning of L. P. G. 5) Cutting of carrots. Answer: 1) Physical change: No change in mass. 2) Chemical change: Properties of the original substance change. 3) Physical change: No cha..

1. The refracting surface is assumed to be at the origin O, with its axis along X'OX as shown in figure. 23.51. 2. The incident rays are drawn from left to right. 3. Distances are measured from the origin. Distances measured in the same direction as the incident ray is take..