Energy Sources
What is the source of all energy?
the sun
What kind of lens can correct short-sightedness?
concave
True or false: sound does not travel in a vacuum.
True
What did Alexander Graham Bell invent in 1876?
telephone
How many planets in our solar system?
8
Name a fossil fuel
coal, oil or gas
What do we call the angle at which light hits a surface?
angle of incidence
Give an example of a string instrument
[any example, e.g. guitar, violin, cello]
Who invented Morse code?
Samuel Morse
Which planet is furthest from the Sun?
What does conserve mean?
save
What is the law of reflection?
angle of incidence is equal to the angle of reflection
Give an example of a percussion instrument
[e.g. drum]
What were the first telephone wires made of?
copper
Which planet is the second smallest?
Mars
Name a renewable energy source
solar, hydro, wind
What is refraction?
when light changes direction as it passes through a different material
What kind of instrument is a flute?
wind
What is the name of the machine invented to carry Morse code messages?
telegraph
Who was the first person in space?
Yuri Gagarin
When we eat food to give us energy to move, what kind of energy transformation is taking place?
chemical > kinetic
What part of the eye is light focussed to create an image?
retina
echolocation
How does a mobile phone send and receive signals?
microwaves (or radio waves)
What is our next closest star, after the sun?
Proxima Centauri