Properties of Light
What is the speed of light in kilometers per second?
300,000 kilometers per second
What creates sound waves?
Vibrations
Name a source of natural light.
The Sun
What part of the human body vibrates when sound waves reach it?
Eardrum
How does light help us see objects around us?
Light reflects off objects and travels to our eyes, allowing us to see.
Name one natural and one artificial source of light.
Natural: Sun
Artificial: Light bulb
What is the term for how high or low a sound is?
Pitch
What is light pollution?
Excessive artificial light that brightens the night sky and affects the environment.
What is an echo?
A sound that is reflected back to the listener.
Why do we hear sound differently in an empty room compared to a room with furniture?
An empty room causes sound to reflect more, creating echoes, while furniture absorbs sound waves.
What happens to light when it hits a mirror?
It reflects.
What is the difference between high-frequency and low-frequency sounds?
High-frequency sounds have more vibrations per second and are high-pitched. Low-frequency sounds have fewer vibrations and are low-pitched.
What type of light source is a firefly?
Natural light
How do animals like bats and dolphins use sound waves to navigate?
They use echolocation to sense their surroundings.
How do sunglasses protect our eyes from harmful light?
Sunglasses block or filter out harmful UV rays.
What term is used when light bends as it passes through water or glass?
Refraction
What is the term used to describe the loudness of a sound?
Amplitude
Name two light sources that emit both light and heat.
The Sun, Fire
Which type of sound wave has a higher amplitude: a whisper or a loud concert?
A loud concert
How do microphones and speakers modify sound?
Microphones capture sound waves and convert them into electrical signals, while speakers convert the signals back into sound waves.
What type of material does not allow any light to pass through?
Opaque material
How do soft materials like curtains and foam affect sound waves?
They absorb sound waves.
What is the difference between a source of light and a reflector of light?
A source of light produces its own light, while a reflector of light bounces light from another source.
How can sound waves travel through solids, liquids, and gases?
Sound waves cause particles in the medium to vibrate, allowing the sound to move through different states of matter.
Why is it important to limit exposure to both bright lights and loud noises?
Prolonged exposure can damage our vision and hearing, leading to long-term health issues.