5 Written Questions
5 Matching Questions
- Why were Newton's three laws so important to astronomy?
- the energy flux, F, from a star is the amount of
- The best shape for the cross-section of a simple astronomical mirror in order to produce the sharpest images of very distant objects at its prime focus is a(n)
- The spectrum of a star shows a set of dark absorption lines equivalent to the absorption lines of the Sun but with one exception: Every line appears at a slightly longer wavelength, shifted toward the red end of the spectrum. What conclusion can be drawn from this observation?
- Visible wavelengths of electromagnetic radiation have a range of wavelengths of
- a parabolic shape.
- b energy emitted by each square meter of the star's surface each second.
- c The star is moving rapidly away from Earth.
- d Newton's laws showed that planets can move around the Sun by themselves forever, without coming to rest.
- e 400 nm to 700 nm
5 Multiple Choice Questions
- distance that light travels in one year.
- point where the Sun crosses the celestial equator moving northward in its path across the sky.
- the direction of an object's motion changes.
- in circular epicycles while the centers of the epicycles move in circular orbits around the Earth.
5 True/False Questions
What is the main reason for using several radio telescopes together as an interferometer? → to obtain much better angular resolution or sharpness in the images.
The hot, dense gas existing on the Sun emits energy → opposition.
A perfect circle is an ellipse with an eccentricity of → angle
To a physicist, a blackbody is defined as an object that → absorbs all radiation that falls on it.
What is the half-life of a sample of matter containing radioactive element? → Solar spectra show absorption in spectral lines that are characteristic of iron and are unique to it.