The first chapter sound phenomenon

First of all, the generation and spread of sound

Chapter II Light Phenomenon

First of all, the spread of light

Chapter III Lenses and Their Applications

First of all, the lens

Chapter IV Changes in the Situation

I. Thermometer

Chapter V Current and Circuit

First of all, charge

Shangjiaoban

Chapter 1: Sound

1. 1 sound wave generation and propagation

Chapter II: Light

2. 1 light reflection

Chapter III: Movement and Strength

3. 1 mechanical movement

Guangdong Education and Shanghai Science Edition

Chapter 1 Entering the Material World

I hope you like physics.

Chapter II Sound and Environment

How do we hear the sound?

Chapter III Light and Eyes

3. 1 Light World Tour

Chapter IV Mentality and Material Changes

Talking about global warming

Chapter 5 The substances around us

5. 1 object mass