physics & chemistry book by Bhagya Nagar

This physics & chemistry book by Bhagya Nagar contains class notes on Physics, covering topics like Heat, Sound, and Light.

Heat (ఉష్ణం):

• Heat is a form of energy and always flows from higher to lower temperature.

• The device used to measure heat is a 'Calorimeter'.

• Heat transmission methods include Conduction (ఉష్ణ వాహనం), Convection (ఉష్ణ సంవహనం), and Radiation (వికిరణము).

• Temperature (ఉష్ణోగ్రత) is the measure of the hotness of an object. Its SI unit is Kelvin (కెల్విన్), and it is measured using a 'Thermometer'.

• Water has maximum density at 4 deg C

Sound (ధ్వని):

• Sound is produced by vibrating objects. The study of sound is called Acoustics (ఎకోస్టిక్స్).

• The SI unit of frequency (పౌనః పున్యం) is Hertz (Hz), and the SI unit of sound intensity (ధ్వని తీవ్రత) is Decibel (డెసి బెల్).

• Sound is classified into three types based on frequency: Infrasonic (శ్రవ్యా ధ్వనులు) (below 20 Hz), Audible (పరశ్రవ్య ధ్వనులు) (20 Hz to $20,000 Hz), and Ultrasonic (అతిధ్వనులు) (above 20,000Hz).

• Sound requires a medium to travel (solid, liquid, or gas). The speed of sound is highest in solids.

• Sound wave speed in air is 330 msec.

Light (కాంతి):

• Light travels in a straight line.

• The speed of light in air or vacuum is 3 X 10^8ms

• The phenomenon of light separating into seven colors is called Dispersion (కాంతి విశ్లేషణం). The seven colors are denoted by VIBGYOR.

• Violet has the shortest wavelength and highest energy, while Red has the longest wavelength and lowest energy.

• Primary colors are Red, Green, and Blue (RGB).

• Optical Fibers and Endoscopy work on the principle of Total Internal Reflection (సంపూర్ణాంతర పరావర్తనం).