Light and Sound
What is light?
Light is is a form of electromagnetic energy that our eyes can detect. It travels in a straight line.
What is energy?
Energy is the ability to do work.
What is a vibration?
Vibrations are invisible waves that move up and down very quickly.
7. What is the speed of light?
a) 3 kilometres per second
b) 3000 kilometres per second
c) 30 000 centimetres per second
d) 300 000 kilometres per second
d) 300 000 kilometres per second
What is sound?
Sound is created when something vibrates and sends waves of energy or vibration into our ears.
What is an example of a non-renewable resource? Give an example.
A nonrenewable resource is something that can only be used once. Coal, oil, and natural gas are all examples.
9. Which of the following does not produce both light and heat?
a) A fire
b) The sun
c) A candle
d) A phone light
d) A phone light
Which of the following is not an example of conserving resources:
a) Leaving the tap running while brushing your teeth.
b) Turning off all the lights before leaving the house.
c) Walking to school instead of driving
d) Hanging up laundry to dry outside.
a) Leaving the tap running while brushing your teeth.
What is an example of natural light? Choose 2
The Sun
Flashlight
Computer
Fireflies
The Sun, Fireflies
________ energy is created through electromagnetic waves. A major source of it is the sun.
Radiant
_________ is when light stops at an object and doesn’t reflect
Absorption
Which option is a high-pitched sound?
a) A cricket
b) A low voice
c) A bass drum
d) Thunder
___________ is when light bounces off the surface of a material
__________ energy is energy at work.
a) Physical
b) Kinetic
c) Static
d) Potential
b) Kinetic
_________ is the energy released through a chemical reaction.
Chemical
Why do most people today prefer to use LED lights rather than older light bulbs?
Older lightbulbs create a lot of heat energy that is dissipated. This is wasted energy. LED lights generate less heat and are more energy efficient.
____________ measures the number of sound vibrations per second.
Frequency
Digesting food is an example of which form of energy?
a) Nuclear
b) Light
c) Radiant
d) Chemical
Chemical
_______ is the energy that comes from splitting an atom.
Nuclear
Rico feels a “zap” when he takes his socks from the dryer. Explain why. What form of energy is this?
The zap is caused by static electricity. Static electricity occurs when an object is charged with electrons, like when clothes stick together after being in the dryer.