Test #1 - Review Questions Flashcards
Review Questions for Test #1 (22 cards)
If Earth’s mass doubled while its radius remained the same, which of the following would NOT occur?
A. Your mass would double
B. Your weight would double
C. The surface gravity would double
A
The size of Earth has nothing to do with your mass
If a planet’s radius is half that of Earth, but its surface gravitational acceleration is the same as that of Earth, its mass must be ____ that of Earth.
A. four times
B. two times
C. half
D. a quarter
B
A feather and a hammer are dropped on the Moon. They are dropped from the same height, at the same time, and hit the ground at the same time because…
A. the force of gravity is larger on the feather than on the hammer
B. gravity has no effect on either object
C. the acceleration of each object is the same
D. it shows that Galileo’s experiment was false
C
without air resistance, the only force acting on the objects is the acceleration due to the Moon’s gravity
Which of the following is part of Kepler’s first law?
A. planets move in perfect circles with the sun at the center
B. planets move along an elliptical path with the sun at the center
C. planets move along an elliptical path with the sun at one focus
D. planets move along an elliptical path with the Earth at one focus
C
You’re riding on a bus travelling at a constant speed when the driver slams on the brakes. Which of these statements describes your subsequent motion?
A. You fly toward the front of the bus because of a net force acting on you
B. You fly toward the front of the bus because of your inertia
C. You fly toward the back of the bus because of a net force acting on you
D. You fly toward the back of the bus becuase of your inertia
B
In the Earth’s orbit around the Sun, the Sun is located at one focus. What is located at the other?
A. Nothing
B. The Moon
C. Venus
D. The James Webb Telescope
A
When you sit in a chair, the force you exert on the chair is ____ the force the chair exerts on you.
A. Less than
B. The same as
C. Greater than
D. It depends on your mass
B
The recoil of a gun is an example of conservation of…
A. Angular momentum
B. Energy
C. Momentum
D. Force
C
As bus is going around a round-about at 20 mph. Which of the following quantities are constant while the bus is in the round-about?
A. The net force on the bus
B. The bus’ speed
C. The bus’ velocity
D. The bus’ acceleration
E. The bus’ momentum
B
A metal wire heated to a high temperature will emit a ____ spectrum.
A. Continuous
B. Emission line
C. Absorption line
B
If light from a blackbody passes through a cool cloud of gas and then into a spectroscope, what kind of spectrum will be observed?
A. Continuous
B. Emission line
C. Absorption line
C
Your body temperature is ~300 K and you emit the most radiation at a wavelength of ~10μm. When you have a fever, your body temperature rises and you emit ____ overall radiation.
A. less
B. the same amount of
C. more
C
When you have a fever, the strongest radiation you emit will have ____ wavelength than normal.
A. a longer
B. the same
C. a shorter
C
Why are gamma rays typically harmful to life forms while radio waves are typically harmless?
A. radio waves have a bluer color than gamma rays
B. radio waves cannot pass through mountains
C. gamma rays carry less energy per photon
D. gamma rays cannot pass through mountains
E. gamma rays carry more energy per photon
E
this allows them to ionize elements and molecules which is very bad
The sun’s surface temperature is about 6000 K. If it were to suddenly become hotter, where would most of its radiation be emitted?
A. In the optical, infrared, microwave, or radio region
B. Uniformly at all wavelengths
C. In the infrared
D. In the optical
E. In the optical, UV, X-ray, or gamma ray region
E
As compared to a hot star, a cooler star emits light most strongly at a ____ wavelength.
A. shorter
B. longer
B
As compared to a hot star, a cooler star emits light most strongly at a ____ frequency.
A. Lower
B. Higher
B
As compared to a hot star, a cooler star appears ____ in color.
A. redder
B. bluer
A
When an atom undergoes radioactive decay, a neutron can turn into a proton. If the atom retains its original number of electrons, which of the following do NOT change?
A. atomic mass number
B. atomic number
C. total electric charge
D. A and C
E. B and C
F. A, B, and C
D
The rotating cloud of gas from which the solar system formed shrank over time. As the cloud shrank…
A. it rotated faster
B. its rotation rate remained constant
C. it rotated slower
A
One of the purple lines in the hydrogen emission spectrum has a rest wavelength of 410.2 nm. This line in the spectrum of Betelgeuse is observed at a wavelength of 410.23 nm. Thus, Betelgeuse’s radial motion is…
A. toward us
B. away from us
C. zero relative to us
B
An electrically neutral atom of oxyegn-23 has Z protons, N neutrons, and E electrons. If oxygen’s atomic number is 8, what are Z, N, and E?
A. 23, 23, 23
B. 23, 8, 23
C. 8, 8, 23
