5 Written Questions
5 Matching Questions
- The atomic nuclei of the same element always have the same number of protons.
- Energy and power are different words for the same thing.
- Which of the following statements about electrons is not true?
A) Electrons orbit the nucleus rather like planets orbiting the Sun.
B) Within an atom, an electron can have only particular energies.
C) An electron has a negative electrical charge.
D) Electrons have very little mass compared to protons or neutrons.
E) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels.
- How much electrical charge does an atom with 6 protons, 6 neutrons, and 5 electrons have?
A) a total charge of +17
B) a negative charge of -5
C) a positive charge of +7
D) a positive charge of +1
E) none of the above
- Suppose you know the frequency of a photon and the speed of light. What else can you determine about the photon?
A) its temperature
B) its acceleration
C) its wavelength and energy
D) the chemical composition of the object that emitted it
- a A) Electrons orbit the nucleus rather like planets orbiting the Sun.
- b D) a positive charge of +1
- c C) its wavelength and energy
- d True
- e False
5 Multiple Choice Questions
- C) The star is moving toward us.
- A) The galaxy is moving away from you.
- B) Its surface is cooler than the surface of the Sun.
- A) absorbs ultraviolet light
- B) The peak of the star's thermal emission tells us its temperature: hotter stars peak at shorter (bluer) wavelengths.
5 True/False Questions
Which of the following statements about X rays and radio waves is not true?
A) Neither X rays nor radio waves can penetrate the earth's atmosphere.
B) X rays have shorter wavelengths than radio waves.
C) X rays and radio waves are both forms of light, or electromagnetic radiation.
D) X rays have higher frequency than radio waves.
E) X rays have higher energy than radio waves. → A) Neither X rays nor radio waves can penetrate the earth's atmosphere.
The wavelength of a wave is
A) how strong the wave is.
B) the distance between a peak of the wave and the next trough.
C) the distance between two adjacent peaks of the wave.
D) the distance between where the wave is emitted and where it is absorbed.
E) equal to the speed of the wave times the wave's frequency. → C) the distance between two adjacent peaks of the wave.
If we observe one edge of a planet to be redshifted and the opposite edge to be blueshifted, what can we conclude about the planet?
A) We must actually be observing moons orbiting the planet in opposite directions, not the planet itself.
B) The planet is rotating.
C) The planet is in the process of falling apart.
D) The planet is in the process of formation. → True
Electrons orbit an atomic nucleus like planets orbit the Sun. → False
When considering light as made up of individual "pieces," each characterized by a particular amount of energy, the pieces are called ________.
C) gamma rays
D) frequencies → False