Version C

Chose the best answer.
Write your name at the top of this quiz as well as on your answer sheet, and hand them both in at the end of the quiz. WRITE YOUR VERSION ON YOUR ANSWER SHEET. Feel free to write or draw on the quiz.
Please put away all electronic devices.

CHOOSE THE BEST ANSWER FOR EACH PROBLEM.

1. Ionization is:
a) When an electron in an atom jumps up to a higher energy level in the atom.
b) When an electron in an atom jumps down to a lower energy level in the atom.
c) When a spacecraft escapes from the gravitational field of a planet.
d) When an electron captures a free electron, and the electron becomes bound to the atom.
e) When an electron in an atom escapes from the atom.

e) When an electron in an atom escapes from the atom.

2. An elephant is balanced on one end of a seesaw. On the other end there is a large weight with a mass of 500 kg. For the seesaw to be balanced, if the weight is 20 meters from the pivot point, the elephant must be 10 meters from the pivot point (center of mass). How massive is the elephant?
a) 250 kg.
b) 500 kg.
c) 1000 kg.
d) 2000 kg.
e) 4000 kg.

c) 1000 kg.

3. A blackbody spectrum is produced by a:
a) high density gas or a solid.
b) low density gas.
c) low density gas in front of a source of continuous light.
d) star like the Sun.
e) the atmosphere of the Sun during a total solar eclipse.

a) high density gas or a solid.

4. Which of the following statements is correct?
a) X-ray photons have lower energy and lower frequency than UV.
b) X-ray photons have higher energy and lower frequency than UV.
c) X-ray photons have lower energy and higher frequency than UV.
d) X-ray photons have higher energy and higher frequency than UV.
e) X-ray photons have higher mass and lower energy than UV.

d) X-ray photons have higher energy and higher frequency than UV.

5. Stefan's Law relates:
a) The frequency of light to its wavelength.
b) The luminosity of a solid or dense gas to its temperature.
c) The amount spectral lines are shifted and velocity of the source of light.
d) The orbital period of a planet around the Sun and the semi-major axis of its orbit.
e) The temperature of a solid or dense gas and the wavelength of the peak of its spectrum.

b) The luminosity of a solid or dense gas to its temperature.

6. In the energy level diagram of hydrogen, the levels get closer and closer together as the energy increases. The red H-alpha emission line of hydrogen is produced when an electron jumps from energy level 3 to energy level 2 in a hydrogen atom, while a jump from level 4 to level 2 produces the blue-green H-beta line, and a jump from level 4 to level 3 produces IR light. What does a jump from level 99 to level 98 produce?
a) blue light.
b) gamma rays.
c) X-rays.
d) radio waves.
e) orange light.

d) radio waves.

7. An astronaut in space who is in freefall towards the Earth:
a) has no acceleration.
b) has zero gravitational force pulling on him/her.
c) is moving at a constant speed.
d) has no mass.
e) none of the above.

e) none of the above.

8. Which of the following is a unit of frequency?
a) meters/second.
b) Joule.
c) Hertz.
d) Angstrom.
e) Kelvin.

c) Hertz.

9. In the Kelvin scale, the filament in Light Bulb A has a temperature that is three times that in Light Bulb B. Therefore:
a) The wavelength of the peak of the spectrum of Bulb A is three times that of Bulb B
b) The wavelength of the peak of the spectrum of Bulb A is 1/3rd that of Bulb B
c) The wavelength of the peak of the spectrum of Bulb A is the same as that of Bulb B
d) The wavelength of the peak of the spectrum of Bulb A is nine times that of Bulb B
e) The wavelength of the peak of the spectrum of Bulb A is 1/9th that of Bulb B

b) The wavelength of the peak of the spectrum of Bulb A is 1/3rd that of Bulb B

10. A redshift is:
a) A change in the wavelength of the peak of the spectrum of an object, as the temperature of the object changes.
b) An increase in the wavelength of the light from an object, due to the object and the observer moving apart.
c) A change in the energy of an electron, when it jumps to a higher energy level in an atom.
d) The bending of a ray of light as it goes from one medium to another.
e) The emission of a photon of light by an atom, when an electron in the atom jumps to a lower energy level.

b) An increase in the wavelength of the light from an object, due to the object and the observer moving apart.

11. A joule/sec is a/an:
a) Watt.
b) nanometer.
c) Hertz.
d) Angstrom.
e) calorie.

a) Watt.

12. What is the boiling point of water at the atmospheric pressure at the surface of the Earth?
a) 212 degrees Celsius.
b) 0 degrees Kelvin.
c) 32 degrees Celsius.
d) 212 degrees Fahrenheit.
e) 100 degrees Fahrenheit.

d) 212 degrees Fahrenheit.

13. If the Sun were 3 A.U. away from us, how would its brightness change, relative to what it is now?
a) It would DECREASE by a factor of 3.
b) It would DECREASE by a factor of 3² = 9.
c) It would DECREASE by a factor of 3⁴ = 81.
d) It would INCREASE by a factor of 3.
e) It would not change.

b) It would DECREASE by a factor of 3² = 9.

14. The most energetic photons are:
a) Gamma Ray.
b) Visible.
c) Ultraviolet.
d) Radio.
e) Infrared.

a) Gamma Ray.

15. Which kind(s) of light has/have wavelengths greater than that of visible light?
a) Only X-rays.
b) Ultraviolet, X-rays, and Gamma Rays.
c) X-rays, Gamma Rays, and Infrared.
d) Radio waves and Infrared.
e) Radio waves and Ultraviolet.

d) Radio waves and Infrared.

16. The acceleration of the Moon due to the Earth's gravitational force is:
a) zero.
b) in the direction of its motion in its orbit.
c) towards the Earth.
d) away from the Earth.
e) in the direction opposite its motion in its orbit.

c) towards the Earth.

17. The mass of Saturn is about 3500 times that of Titan. The center of mass in of the Saturn-Titan system is:
a) About 1/3500th the distance between Saturn and Titan, closer to Saturn.
b) About 1/3500th the distance between Saturn and Titan, closer to Titan.
c) About 1/3500² the distance between Saturn and Titan, closer to Saturn.
d) About 1/3500² the distance between Saturn and Titan, closer to Titan.
e) Halfway in between Saturn and Titan.

a) About 1/3500th the distance between Saturn and Titan, closer to Saturn.

18. An Angstrom is a unit of:
a) Frequency.
b) Energy.
c) Distance.
d) Velocity.
e) Luminosity.

c) Distance.

19. What type of atom has 1 proton, 1 neutron, but no electrons?
a) ¹H⁺
b) ²H⁺
c) ²He⁺
d) ³He⁺
e) ⁴He²⁺

b) ²H⁺

20. The total amount of energy per second emitted in the form of light by a star in all directions is called its:
a) kinetic energy.
b) frequency.
c) brightness.
d) temperature.
e) luminosity.

e) luminosity.