5 Written questions
5 Matching questions
- One light-year is the
- What is the half-life of a sample of matter containing radioactive element?
- When Saturn is closest to the Earth, it is at
- The position of an element in the periodic table is directly related to the
- the energy flux, F, from a star is the amount of
- a energy emitted by each square meter of the star's surface each second.
- b number of protons in the atomic nucleus and hence its positive charge.
- c opposition.
- d distance that light travels in one year.
- e time needed for half the radioactive atoms in the sample to decay.
5 Multiple choice questions
- violet light has a shorter wavelength than red light.
- The air molecules scatter blue light better than red light, so more blue light reaches our eyes.
- closer to the Earth than the Sun is.
- temporary reversal of the planet's normal west-to-east motion past the background stars as seen from the Earth.
- spectroscopy of the light emitted by the star.
5 True/False questions
A perfect circle is an ellipse with an eccentricity of → zero.
Which of the following characteristics of an astronomical telescope is the most important for determining the angular resolution? → diameter of the objective lens or mirror.
Visible wavelengths of electromagnetic radiation have a range of wavelengths of → temporary reversal of the planet's normal west-to-east motion past the background stars as seen from the Earth.
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.
According to modern atomic theory, light emitted by atoms originates from → transitions of electrons between electron levels of the same atom.