5 Written Questions
5 Matching Questions
- Kepler's first law states that a planet moves around the Sun in a(n)
- According to Newton's laws, a for must be acting whenever
- A planet at inferior conjunction is always
- The chemical makeup of a star's surface is usually inferred by
- What is the half-life of a sample of matter containing radioactive element?
- a the direction of an object's motion changes.
- b closer to the Earth than the Sun is.
- c elliptical orbit, with the Sun at one focus.
- d spectroscopy of the light emitted by the star.
- e time needed for half the radioactive atoms in the sample to decay.
5 Multiple Choice Questions
- visible light, UV radiation, X rays, gamma rays
- shows absorption features where light has been absorbed by the atoms of the cool gas.
- in circular epicycles while the centers of the epicycles move in circular orbits around the Earth.
- proved mathematically that light could b described by oscillating electric and magnetic fields.
- Solar spectra show absorption in spectral lines that are characteristic of iron and are unique to it.
5 True/False Questions
To a physicist, a blackbody is defined as an object that → path traced out by the Sun in our sky over one year against the background stars.
Why was adaptive optics developed? → The air molecules scatter blue light better than red light, so more blue light reaches our eyes.
Why is the sky blue? → bending of light as it enters a dense but transparent material at an angle to the perpendicular to the surface of the material.
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? → celestial equator and the star, measured along a great circle passing through both celestial poles.
Are the constellations seasonal? → Yes, On a summer night many of the constellation you can see are different from the constellations you can see on a winter night. But there are some constellations you can see all year long.