Gas molecules move freely in all directions and have high kinetic energy. They are widely spaced with weak intermolecular forces. They collide elastically with each other and container walls. Their movement depends on temperature and pressure. Gases expand to fill any space and are easily compressed due to low density.
Chapter 12 of Class 11 Physics covers Waves for the CBSE Exam 2024-25. It explains wave motion and types of waves including mechanical and electromagnetic. It describes properties like wavelength and frequency. Concepts of superposition and interference are included. The chapter also discusses reflection and refraction. It helps in understanding real-life wave phenomena and practical applications.
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The root mean square speed of gases molecules is provided by:
vₘₛ = √(3RT/M)
– Here:,
R: It is the Universal Gas Constant,
T : This is Absolute temperature
M : It refers to molar mass of a gas.
Here this formula provides a condition showing that rms increases with an increment in temperature while the rms declines as molar mass increases.
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