Vocabulary Unit 4 Nat.Sci.

Here are some workds you must known its meaning to understand this unit 4.

 Sound: Vibrations that travel through the air or another medium and can be heard when they reach a person's ear.

Energy: The ability to do work or cause a change.

Vibration: A rapid back-and-forth movement of an object.

Pitch: How high or low a sound is.

Frequency: The number of vibrations or waves per second.

Amplitude: The height or strength of a sound wave.

Volume: The loudness or softness of a sound.

Decibel: A unit used to measure the intensity or loudness of sound.

Echo: A reflected sound wave.

Resonance: When an object vibrates at the same frequency as another object, making the sound louder.

Reverberation: Repeated reflections of sound waves in an enclosed space.

Wavelength: The distance between one point of a sound wave to the same point on the next wave.

Sound wave: The pattern of vibrations that produces sound.

Medium: The material through which sound travels, such as air, water, or solid objects.

Compression: The part of a sound wave where particles are pushed together, creating a higher pressure area.

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Why is sound an energy:  (easy explanation)

Imagine sound as tiny invisible waves that travel through the air. 

These waves are like a bunch of little pushes or squeezes in the air that our ears can feel. Now, let me explain how sound is a sort of energy:

Sound Starts with Something Moving: First, something has to move or vibrate to make a sound. It could be your vocal cords when you talk, a guitar string when you pluck it, or even a drum when you hit it with a stick.

It Makes Air Move: When something vibrates, it pushes and pulls the air around it. Imagine a bouncing ball making ripples in a pond; that's how air moves when something makes a sound.

Air Carries the Energy: As the air moves, it carries the energy from the vibrating thing to your ears. This energy travels as waves through the air, just like ripples spreading on the surface of the pond.

Your Ears Feel It: When these waves reach your ears, they make your eardrums vibrate too. Your eardrums are very tiny, so they move just a little bit.

Your Brain Understands It: Your brain is super smart! It can understand these tiny eardrum vibrations and turns them into sounds. That's how you hear things like music, voices, or even a bird singing.

So, sound is like energy because it's created when things move and make the air around them move. This moving air carries the energy to your ears, and your brain turns it into the sounds you hear. It's like a special kind of energy that lets you enjoy music, talk with friends, and hear all the amazing sounds in the world!