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P1 Telescope
| Question | Answer |
|---|---|
| Large telescopes which collect visible light to explore the Universe are usually placed near the tops of mountains. Suggest why radio telescopes do not have to be placed high up a mountain. | |
| One theory of the origin of the Universe predicted that there should be cosmic background radiation with a wavelength of about 1 mm. Explain why scientists had to wait until the development of space flight before they could study this radiation in deta | |
| The electromagnetic radiation from most galaxies has a red-shift. Suggest why, when a galaxy has a very large red-shift, some of its visible light is not detected through the Earth’s atmosphere. | |
| What is the role of the eyepiece of a telescope? | to magnify the image (to make it larger) |
| What is the role of the objective lens of a telescope? | to create an image inside the tube of the telescope |
| What happens to a ray of light when it goes from the air inside a piece of glass? | The ray bends/changes direction: it is refracted |
| What happens to the frequency of a ray of light when it goes from the air inside a block of glass? | |
| What happens to the speed of a ray of light when it goes from the air inside a block of glass | The rayu of light will slow down |
| How can you measure the focal length of a convex lens? | Get a focused (not blurred) image of a distant object onto a screen. Measure the distance between the lens and a screen. |
| What can you say of the relationship between focal length and thickness of a convex lens? The thicker the lens,..... | The thicker the lens, the smaller the focal length |
| What is the difference between a real image and a virtual image? | The virtual image can not be shown on a screen. A real image can be shown on a screen. |
| What are the 2 problems with refracting telescopes seeing very far objects? | 1)Some of the light of a star will be reflected so the image will be very faint. 2)They need to have very long and/or have large lenses: this leads to the image being distorted |
| What is the difference between a refracting and a reflecting telescope? | The refracting telescope uses lense; the reflecting telescope uses a curved mirror. |
Created by:
ursulinephys
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