What is Light? Properties of Light
Light is a type of ______.
Energy
The organs allow people to see
Eyes
Natural Light is light that is....
Artificial Light is light from....
produced by things in nature, such as the sun.
things made by humans, usually powered by electricity or gas.
Sound is created....
when something vibrates and sends waves of energy or vibration into our ears.
Artificial light, like street lights, are important to humans. It allows people to see once the _____ has ____.
sun has sets
Something that produces light is called
Light Source
Light enters the eye through the _____ and reaches the _____
pupil and lens
Candle, light bulbs, fireworks, cellphone, flashlight, computer, campfire, fireplace, match, toys and neon lights are examples of ______ light
artificial
When sound waves reach your ears, they make your __________ vibrate. When your _________ vibrate, you hear the sound!
eardrums
Light pollution
too much artificial light
Light travels in straight paths called
Light Waves
The optic nerve receives _____ ________ and sends a message to the _______ to create images
light signals and brain
Sunlight, firefiles, lava and lightning are examples of _________ light.
natural
Vibrations are invisible ______ that move ___ and _____ very _______
waves that move up and down very quickly
Light pollution impacts our earth because
1) celestial objects (stars and planets) are harder to see.
2) Artificial light at night increases stress, anxiety, and fatigue (tiredness)
3) Artificial Light disrupts a human's natural sleep cycle.
4) Light Pollution confuses animals and disrupts their migration patterns.
Absorption of light occurs when light stops at the object and does not reflect or refract. Ex. Wood absorbs light. Reflection of light occurs when light bounces off the surface of a material. Ex. Glass and Mirrors reflect light. Refraction of light occurs when light passes through an object and bends. Ex. Diamonds and Water refract light.
Retina
The moon, safety vest, glitter, and a cat's eye are _________ of light, whereas stars, a light bulb, fireflies, a laser, the sun, and a candle are ________ of light.
reflections and sources
Sound Frequency is the number of _________ made per __________
Pitch is used to describe the quality of a ________.
Give examples of the high pitch and low pitch sounds.
Sound Frequency is the number of vibrations made per second
High pitch sounds: crickets, whistles, and a squeal.
Low pitch sounds: bass guitar, thunder, and a deep voice.
Noise pollution
any disruptive sound that affects living things.
The speed of light is
300 000km
How do eyes get damaged?
some things do not actually create (emit) their own light, they look like they do because light bounces off them this is called....
reflecting
Loud sounds have a higher ___________. Amplitude is the.....
Give examples of sounds with high amplitude.
Amplitude. distance from the top (peak) of the sound wave to the bottom (trough).
Construction work, loud concerts, lawnmowers, and fireworks.
Noise pollution has consequences such as
leading to heart disease, stress, and sleep disruptions in humans. It can also lead to health problems for animals. It disrupts their ecosystems and makes it difficult for them to catch prey.