SPACE Signals From Space Flashcards
Define galaxy
Large cluster if stars and dusts that is spinning and travelling
Define universe
Many galaxies separated by empty space
Define star
Large ball of matter (ball of gases) that is under going nuclear fusion and emitting heat and light
Define sun
Our solar systems star
Define solar system
Central star orbited by plantes
Define planet
Large ball of matter that orbits a star, reflectin flight and emitting no energy
Define moon
An object which orbits a planet and reflects light
How long does it take light to reach the earth from the sun
8 minutes
How long does it take light to reach the earth from the nearest star
4.3 years
What is the nearest star called?
Proxima Centauri
How long does it take light to reach the earth from the edge of the galaxy?
100,000 years
What is a light year?
The distance traveled by light in one year.
What happens when weight light is shone through a prism
The white lights splits into a spectrum
All colours have different ____ and _____.
Wavelengths and frequencies
Place green red and blue in order of wavelength
Red (longest) green blue
Name colours in spectrum
Red, orange, yellow, green, blue, indigo and violet
Which light is more refracted, blue or red?
Blue
Why is deduction of spectrum useful for classifying elements?
Each element has an individual line spectra
Different radiation in the electromagnetic spectrum have different ______.
Wavelength
Why are different telescopes/detectors needed for different types of radiation?
Different waveleghtn
Give a detector for gamma rays
Geiger muller tube
Give a detector for x rays
Photographic film
Give a detector for ultraviolet
Fluorescent paint
Give a detector for visible light
Eye
Give a detector for infrared
Blackened thermometer
Give a detector for microwaves
Aerial
Give a detector for TV and radio
Aerial
Give electromagnetic series
Gamma, x, ultraviolet, visible, infrared, microwaves, tv, radio
Which radiation has shortest wavelethg?
Gamma
Which radiation has longest wavelength?
TV and radio
Which radiation has highest frequency
Gamma
Which radiation has lowest frequency
TV and radio
How are visible rays magnified?
Optical refraction telescope
How are radio waves detected?
Radio telescopes
What does a basic telescope consist of?
An objective lean, and eye piece and a light tight tube
GO AN LOOK AT RAY DIAGRAM
Go noooooooow
What does the objective lens do?
Brings e light from a distant object to a focus partway down the tube
What does the eye piece lens do?
Magnifies the image (is a convex lens) which is upside down,
What does the eyepiece do?
Acts as a magnifying glass
Why is a light tight tube used?
To cut out all light from other sources
What happens with a larger diameter of the objective lens?
The more light it collects and therefore the brighter the image
Magnification=
Height of image from eyepiece lens/height of image from objective lens
The ______ lens produces an image which is magnified by the ______
Objective, eyepiece
The brightness of an object depends on
The diameter if the objective lens
Telescopes can be deigned to collect _____, _____ and _______.
Radio waves, infrared and ultraviolet
