key concept reveiw Flashcards
(14 cards)
What do you use to determine the composition and age of stars?
The electromagnetic spectrum
What do we use scientific notation for?
To condense very large or small numbers into a more manageable size
What is the radiation?
The emission of energy
what are the four types of radiation?
Electromagnetic, particle (radio activity), auustic (sound), gravitational
we are exposed to natural electric magnetic radiation from life form:
the sun, radioactive isotopes in earth crust, other celestial objects
when is radiation not harmful?
when there is a low dose of
the electromagnetic spectrum is a range of electromagnetic wave length that includes
radio waves, microwaves, infrared radiation (heat), visible light, ultraviolet light, x-rays and gamma rays
what are electromagnetic waves 3 important characteristics?
speed, wave length, frequency
what part of EM radiation doesn’t change?
speed
what is the equation for speed of light
3x10 8m/s
what two things are inversely proportional to one another?
wave length and frequently
what does it mean when two things are inversely proportional?
one value gets larger and the other one gets smaller
what is scientific notstion used for?
to save space
what is the format for scientific notstion?
Ax10
