Visible Light & Solar System Flashcards
(25 cards)
What do waves do at boundaries between materials?
Reflect and refract
How do u measure the focal length of a converging lens using a distant object?
- Hold the lens in front of the screen
- Point the lens towards a distant object (eg cloud or tree)
- Adjust the distance of the lens until a sharp image is displayed on the screen
- Distance between lens and screen is focal length
What is refraction?
When the light bends towards or away from the normal
What is reflection?
When a wave is bounced off a surface
What is frequency by waves?
Number of vibrations per second
What is the wavelength?
Distance between wave peaks
What is a waves amplitude?
The distance from the rest position to the peak of a wave
What is wave speed?
How fast the wave travels m/s
What is a transverse wave?
Wave when the vibrations are perpendicular to the direction in which the wave travels
What is a longitudinal wave?
The vibrations move in the direction of travel.
What waves do earthquakes produce?
Seismic waves
Primary (P)
Secondary (S)
What type of waves do earthquakes produce?
Both
What type of waves are:
a. Sound
b. Electromagnetic
c. Seismic
a. Longitudinal
b. Transverse
c. Both P= longitudinal
S= transverse
Describe the way that waves transfer energy without transferring matter?
The particles vibrate but don’t follow the propagating wave
How does the reflecting telescope work?
A concave mirror forms an image of a distant object at its focal point.
The flat mirror reflects the rays of light towards the eyepiece.
The eyepiece magnifies the image.
How does a simple (refracting) telescope work?
It has 2 converging lenses
O͟͟b͟͟j͟͟e͟͟c͟͟t͟͟i͟͟v͟͟e͟͟ l͟͟e͟͟n͟͟s͟͟e͟͟s͟͟- forms a real image of a distant object at its focal point
E͟͟y͟͟e͟͟p͟͟i͟͟e͟͟c͟͟e͟͟- viewed from here and magnifies to produce a virtual image
Explain how Galileo’s observations contradicts the geocentric model?
Geocentric model:
Has the Earth at the centre of the universe and everything orbits around it
Heliocentric model:
- moons orbiting Jupiter
- not everything orbits earth therefore the geocentric model is incorrect
Who invented the geocentric model?
Ptolemy
What planets were known Ptolemy?
Mercury, Venus, Mars, Jupiter, Saturn
How Does Uranus discovered?
Telescope
How was Pluto discovered?
Photography
Order of naming planets
Mercury Venus Earth Mars --------- asteroid belt Jupiter Saturn Uranus Neptune ---------- kuiper belt Pluto
Oort cloud
How did scientists use waves to help them understand the solar system?
Visible
How did they use waves to find info bout the milky way?
X-rays to view hot young stars
