Class 9 Physics Ch 7
Important easy to understand Notes of Class 9 Physics Ch 7 English Medium written by Professor Sulman Arif Suib. These notes are very helpful in the preparation of Physics for students of the 9th class Physics English Medium and these are according to the paper patterns of all Sindh Book Boards.
Summary and Contents:
Topics which are discussed in the notes are given below:
- Discuss the kinetic energy of solid.
- Discuss the kinetic energy of Liquid.
- Discuss the kinetic energy of gas.
- What is Brownian Motion.
- State Boyle's Law
- In which state of matter the molecules are widely separated?
- In which state of matter the molecules are most closely packed?
- In which state of matter molecules can move freely at high speed?
- Solved Numerical of the exercise Class 9 Physics Ch 7.
- The pressure on 9cm3 of Oxygen gas is doubled at a fixed temperature. What will its volume become?
- A container holds 30 m3 of air at a pressure of 150000Pa. If the volume changed to 10m3 by decreasing the load on the piston. What will the pressure of the gas become? Assume that its temperature remains constant.
- Air at atmospheric pressure of 760 mm of Hg os trapped inside a container available with a moveable piston. When the piston is pulled out slowly so that the volume is increased from 100dm3 to 150dm3, the temperature remaining constant. What will be the pressure of the air becomes?
- A cylinder contains 60cm3 of air at a pressure of 140kPa. What will its volume be if the pressure on it is increased to 420kPa?
- Air at a pressure of 1.0*105 Pa is contained in a cylinder fitted with a piston. The air is now compressed by pushing the piston, so that the same mass of air now occupies one-fifth the original volume without any change in temperature. Calculate the pressure of the air.