STD X – SOUND – NEWTON

REFLECTION OF LIGHT

Sound is a form of energy like light energy and heat energy.

Sound is a wave made of vibrations in the air.These vibrations create sound waves which move through mediums which can be solid, liquid, or gas, before reaching our ears.

Sound does not travel in a vacuum. Sound, therefore, is not audible in space.

Just like light, the sound gets reflected at the surface of a solid or liquid. This bouncing back of sound when it strikes any surface is the reflection of sound.Repetition of sound caused by the reflection of the sound wave is called as an echo.

In this chapter, we will learn lot more about the reflection of sound, echo, and it’s uses, types of sound waves etc.

VIBRATIONS

We know that Sound is a form of energy and it comes from vibrations

All sounds are made by vibrations of molecules through which the sound travels.

For instance, when a drum or a temple bell is struck, the object vibrates. These vibrations make air molecules move and produce sound.

A louder sound is produced when the vibrations are increased in intensity, and a higher-pitched sound is heard when the vibration frequency is increased. In fact, the frequency of the vibrations is what allows an organism to hear.

CHARACTERISTICS OF SOUND WAVES

Sound is a longitudinal wave that travels through mediums like solid, liquid, gas and it is produced due to vibration of an object. Sound cannot travel in a vacuum.

Sound travels faster in a hot medium. It is much faster in a solid than in a liquid or gas. It also travels faster at sea level (where air pressure is higher).

Humans can characterize sound by frequency, amplitude, and tone.