Sure! Here is a revision sheet about sound for Year 5:

1. What is sound? - Sound is a form of energy that is produced when an object vibrates, creating waves that travel through the air or other mediums.

2. How does sound travel? - Sound travels in waves, which move through the air or other mediums, such as water or solids. - Sound waves are created when an object vibrates, causing particles in the medium to vibrate and pass the energy along.

3. How do we hear sound? - Sound waves enter our ears and cause our eardrums to vibrate. - These vibrations are then transmitted to the inner ear, where they are converted into electrical signals that are sent to the brain. - The brain interprets these signals as sound.

4. Pitch and frequency: - Pitch refers to how high or low a sound is. - The pitch of a sound is determined by its frequency, which is the number of vibrations or cycles per second. - High-frequency sounds have a high pitch, while low-frequency sounds have a low pitch.

5. Volume and amplitude: - Volume refers to how loud or soft a sound is. - The volume of a sound is determined by its amplitude, which is the height of the sound wave. - Larger amplitudes produce louder sounds, while smaller amplitudes produce softer sounds.

6. Reflection and echoes: - Reflection occurs when sound waves bounce off a surface. - When sound waves bounce back to our ears, we hear an echo. - The distance between the original sound and the echo can be used to calculate the speed of sound.

7. Absorption and transmission: - Sound can be absorbed or transmitted by different materials. - Soft materials, like curtains or carpets, absorb sound waves, reducing echoes and making the room quieter. - Hard materials, like walls or floors, reflect sound waves, causing echoes and making the room louder.

8. Musical instruments: - Musical instruments produce sound through vibrations. - Some instruments, like guitars or pianos, produce sound through plucking or striking strings. - Others, like flutes or trumpets, produce sound through blowing air into a tube.

9. Sound in the environment: - Sound is all around us in our environment. - Some sounds, like birds chirping or waves crashing, are natural. - Others, like car horns or sirens, are man-made.

10. Safety and protection: - Loud sounds, especially over a long period, can damage our hearing. - It is important to protect our ears from loud noises by wearing earplugs or earmuffs in noisy environments.

Remember to review these concepts and practice answering questions related to sound. Good luck with your revision!