5 Written questions
5 Matching questions
- Lines of a particular element appear at the same wavelength in both emission and absorption line spectra
- From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?
A) gamma rays, X rays, ultraviolet, visible light, infrared, radio
B) infrared, visible light, ultraviolet, X rays, gamma rays, radio
C) radio, infrared, visible light, ultraviolet, X rays, gamma rays
D) gamma rays, X rays, visible light, ultraviolet, infrared, radio
- Electrons orbit an atomic nucleus like planets orbit the Sun.
- An atom of the element iron has an atomic number of 26 and an atomic weight of 56. If it is neutral, how many protons, neutrons, and electrons does it have?
A) 26 protons, 30 neutrons, 26 electrons
B) 26 protons, 30 neutrons, 30 electrons
C) 26 protons, 56 neutrons, 26 electrons
D) 13 protons, 43 neutrons, 13 electrons
E) 13 protons, 56 neutrons, 13 electrons
- 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) 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.
D) An electron has a negative electrical charge.
E) Electrons have very little mass compared to protons or neutrons.
- a True
- b A) Electrons orbit the nucleus rather like planets orbiting the Sun.
- c False
- d A) 26 protons, 30 neutrons, 26 electrons
- e A) gamma rays, X rays, ultraviolet, visible light, infrared, radio
5 Multiple choice questions
- A) The radio waves from the radio station are causing electrons in your radio's antenna to move up and down 97 million times each second.
- 1. Hotter objects emit more radiation per unit surface area.
2. Hotter objects emit photons with higher average energy.
- C) An electron moves from an upper energy level to a lower one.
- D) A positive charge and a negative charge will attract each other.
5 True/False questions
Which of the following objects is not a close approximation of a thermal emitter?
A) hot, thin gas
B) a star
C) a filament in a light bulb D) you
E) a planet → D) A hot object emits more total radiation per unit surface area than a cool object.
An atom that has fewer electrons than protons is called a/an ________.
D) plasma → C) millions
How can an electron in an atom lose energy to go from a higher energy level to a lower energy level?
A) It loses kinetic energy.
B) It releases a photon equal in energy to its own energy drop.
C) It absorbs a photon equal in energy to its own energy drop. D) It loses gravitational potential energy.
E) It exchanges gravitational potential energy for kinetic energy. → E) electric potential energy
Studying a spectrum from a star can tell us a lot. All of the following statements are true except one. Which statement is not true?
A) The total amount of light in the spectrum tells us the star's radius.
B) The peak of the star's thermal emission tells us its temperature: hotter stars peak at shorter (bluer) wavelengths.
C) We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals.
D) Shifts in the wavelengths of spectral lines compared to the wavelengths of those same lines measured in a laboratory on Earth can tell us the star's speed toward or away from us. → C) An electron moves from an upper energy level to a lower one.
The atomic nuclei of the same element always have the same number of neutrons. → False