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Astronomy Exam 2
Terms in this set (35)
Ptolemy's model of the solar system had the planets?
Moving on epicycles which moved along the deferent whose center was offset from earth by the eccentric.
Copernicus proposed that?
The sun was at the center of the solar system.
Tycho Brahe is best known for?
His continuous, detailed, and accurate observations of the planets and stars.
What is NOT one of Kepler's laws of planetary motion?
The Sun is at the center of the Universe.
In addition to his astronomical observations, Galileo Galilei is known for?
His development of "new" physics to replace the old incorrect physics of Aristotle.
What is NOT one of Newton's 3 laws of motion?
A line drawn from a planet to the Sun will sweep out equal areas in equal time periods. (This is Kepler's 2nd Law silly!)
According to Newton's First Law of Motion?
If an object is moving in a straight line and at a constant speed, it will continue to do so unless some outside force acts on it.
The Universal Law of Gravitation says that every particle of matter in the universe attracts every other particle with a force that varies...
Directly with the product of their masses and inversely with the square of the distance between them.
By combining Newton's Law of Universal Gravitation with Kepler's Third law of planetary motion it is possible to...
Determine the mass of the sun by observing the orbital distance and orbital periods of the planets.
What is NOT a possible orbit of one body around another?
A STRAIGHT LINE
Earth tides on the moon are?
Stronger than lunar tides on the Earth.
High tides on Earth occur?
Just after the moon is directly overhead.
The tidal forces due to the Moon are the result of?
The difference in the strength of the moon's gravitational force acting on different parts of Earth.
The strength of the tides on Earth due to the SUN are?
Weaker than the tides on Earth due to the moon.
Due to tidal friction..
The rotational period of Earth is increasing.
Solar tides are weaker than lunar tides because?
THE SUN IS MUCH FURTHER AWAY THAN THE MOON IS.
What is FALSE about light waves?
The color of light does not depend on wavelength.
What is NOT part of the electromagnetic spectrum?
The electromagnetic spectrum is?
The entire range of "light" from gamma rays to very long radio waves.
The speed of light is?
299792458 m/s for all observers regardless of their speed.
The Rutherford model of the atom had?
Almost ALL the mass is in the nucleus with most of the rest of the atom being EMPTY space with electrons whizzing around.
The modern model of the atom is?
A SMALL nucleus composed of neutrons and protons surrounded by a cloud of electrons.
Atoms emit light when?
An electron spontaneously falls from a high energy state to a low energy state.
An energy level diagram is?
A diagram of the possible energies that an electron can have in an atom.
Black Body Radiation is?
The continuous spectrum of light that is emitted from objects due to their temperature.
BlackBody radiation is (simply)?
A continuous spectrum of light emitted from a hot solid object.
What is NOT a property of blackbody radiation?
All wavelengths are emitted with equal intensity.
The Doppler Effect is?
The change in observed wavelength of a wave when the source is moving with respect to the observer.
If a light source is moving towards you it will be?
Kepler's 1st Law
Planets move in elliptical orbits.
Kepler's 2nd Law
Planets Sweep out equal areas in equal times. (Also planets move faster as they get CLOSER to the sun.)
Kepler's 3rd Law
"Law of Harmonies" The square of the sidereal period divided by the cube of the semimajor axis always equals 1. (BASICALLY, all the planets fit the same ratio, and exist in harmony.)
Newton's 2nd Law of Motion
Pushing an object/applying force causes the object to accelerate. The harder you push/more force you apply, the greater the acceleration. The more massive the object, the less it accelerates in response to a given force. (A = F/M)
Newton's 3rd Law of Motion
Forces always come in pairs, and those pairs are always equal in strength and opposite in direction. (EVERY ACTION HAS AN EQUAL AND OPPOSITE REACTION)
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