Conservation of Energy + waves, light and the electromagnetic spectrum Flashcards
(27 cards)
How do you calculate efficiency?
useful energy out / total energy in
What is conduction?
When heat travels through a solid metal
What colours are good emmiters and absorbers?
Black/matte/dull
Which materials are bad conductors?
Non-metals
How is heat transferred?
Slow vibrations
True or False: White/Shiny/Silver are bad emmiters and absorbers
True
True or False: Non-metals are good insulators because they trap air
True
What are some renewable energy sources?
Solar, geothermal, water power / tidal, hydroelectric.
Why are fossil fuels and nuclear energy sources unreliable?
Global warming, acid rain from coal, CO2 emissions, radioactive waste
True or False: in a transverse wave, oscillations are perpendicular to the direction of energy transfer
True
True or False: in a longitudinal wave the oscillations are not parallel to the direction of energy transfer
False
Are electromagnetic waves transverse or longitudinal?
Transverse
True or false: Mechanical waves can be either transverse or longitudinal
True
What is the order of the electromagnetic spectrum?
Radio, microwave, infared, visible, ultraviolet, xray, gamma
Fill in the blank: Radio, Microwave, ______, Visible, UV, Xray, Gamma
Infared
Fill in the blank: _____, Microwave, Infared, Visible, UV, Xray, Gamma
Radio
What are some dangers of microwave radiation?
Internal heating of body cells
What are some dangers of infared radiation?
Skin burns
True or False: UV rays can damage surface cells and eyes, which may lead to cancer of the skin and eye conditions
True
What are some dangers of x-ray and gamma radiation?
Mutation or damage to cells in the body
What is the mass of an electron?
1/2000th
What is the mass of a proton?
1
What is the mass of a neutron?
1
What is the charge of an electron?
-1
