ASTRO 101 EXAM 1
Which of the following statements about hypotheses is FALSE?
1) a hypothesis must be testable in a way that is replicable
2) a hypothesis is an explanation for natural phenomenon
3) a hypothesis should be created when the outcome for its test is known
4) a hypothesis is an educated guess about why something happens
Because Astronomers typically cannot weigh, touch, or smell the objects they
study, astronomy is usually a ______ science, not an ____ science
observational, experimental
Fact, Law, or Hypothesis?
The ashes from a campfire weigh less than the wood from which they were produced
because fire causes atoms to weigh less
Hypothesis
Fact, Law, or Hypothesis?
,All samples of a pure substance melt at the same temperature under a given set of
conditions
Law
Fact, Law, or Hypothesis?
A certain piece of glass, when heated in an open flame to a temperature near its
melting point, imparts a yellow color to the flame
Fact
Fact, Law, or Hypothesis?
Metal objects, when thrown out a window, always fall to the ground
Law
Which statement is correct?
1) one light year is faster than one mile per hour
2) it takes billions of light years to cross the milky way
3) a light year is the measurement of how many years a source of light will last
4) the nearest star to our sun is about four light years away
, What are the SI base units for mass, length, time, and temperature?
Kilograms, meters, seconds, and Kelvin
What do the prefixes kilo, milli, deci, micro, and centi designate?
10^3, 10^-3, 10^-1, 10^-6, 10^-2
How long does it take light to travel from the Earth to the Sun? the speed of light is
2.998 x 10^5 km/s and the sun is 1.496 x 10^8 km away from Earth, on average
498.99 seconds
Astronomical Units
-earth's average distance from the sun
-a unit that measures length or distance
-approximately 93 million miles (150 million kilometers)
What is 750 light years in AU and km?
-4.743 x 10^7 AU
-7.096 x 10^15
Which of the following statements about hypotheses is FALSE?
1) a hypothesis must be testable in a way that is replicable
2) a hypothesis is an explanation for natural phenomenon
3) a hypothesis should be created when the outcome for its test is known
4) a hypothesis is an educated guess about why something happens
Because Astronomers typically cannot weigh, touch, or smell the objects they
study, astronomy is usually a ______ science, not an ____ science
observational, experimental
Fact, Law, or Hypothesis?
The ashes from a campfire weigh less than the wood from which they were produced
because fire causes atoms to weigh less
Hypothesis
Fact, Law, or Hypothesis?
,All samples of a pure substance melt at the same temperature under a given set of
conditions
Law
Fact, Law, or Hypothesis?
A certain piece of glass, when heated in an open flame to a temperature near its
melting point, imparts a yellow color to the flame
Fact
Fact, Law, or Hypothesis?
Metal objects, when thrown out a window, always fall to the ground
Law
Which statement is correct?
1) one light year is faster than one mile per hour
2) it takes billions of light years to cross the milky way
3) a light year is the measurement of how many years a source of light will last
4) the nearest star to our sun is about four light years away
, What are the SI base units for mass, length, time, and temperature?
Kilograms, meters, seconds, and Kelvin
What do the prefixes kilo, milli, deci, micro, and centi designate?
10^3, 10^-3, 10^-1, 10^-6, 10^-2
How long does it take light to travel from the Earth to the Sun? the speed of light is
2.998 x 10^5 km/s and the sun is 1.496 x 10^8 km away from Earth, on average
498.99 seconds
Astronomical Units
-earth's average distance from the sun
-a unit that measures length or distance
-approximately 93 million miles (150 million kilometers)
What is 750 light years in AU and km?
-4.743 x 10^7 AU
-7.096 x 10^15
