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Studied by 16 peopleNoteStudied by 53 peopleNoteStudied by 49 peopleNoteStudied by 21 peopleNoteStudied by 29 peopleNoteStudied by 10 peopleCH 03: Radiation
If you throw a rock into a pond, it creates a wave in the water. What is responsible for creating an electromagnetic wave?
A stationary uncharged particle |
A vibrating charged particle |
A vibrating uncharged particle |
A stationary charged particle |
Electromagnetic waves consist of co-oscillating electric and magnetic fields.
The wave amplitudes are directed perpendicular to the direction of wave motion.
Energy and information flows parallel to the direction of wave motion.
Electromagnetic waves are able to travel through a vacuum.
Electromagnetic waves travel at a speed of 300,000 km/s.
Which of the following statements are true?
Ultraviolet is named for the part of the spectrum with frequencies greater than those of violet light. |
Gamma is named for its discoverer, Frederic Gamma. |
Infrared is named for the part of the spectrum with frequencies less than those of red light. |
X-ray is named this because it is the least understood part of the spectrum. |
Visible is named this because we can see these waves. |
Radio is named because of the way we hear these waves. |
What is motion wave?
Motion wave is a way in which energy is transferred from place to place with physical movement of material from one location to another. |
Motion wave is a way in which energy is transferred from place to place without physical movement of material from one location to another. |
Motion wave is a way in which material is moving from place to place without energy transferred from one location to another. |
An electron that collides with an atom will
cease to have an electric field. |
produce an electromagnetic wave. |
become magnetized. |
change its electric charge. |
If the speed of light were much slower, so that visual information from nearby traveled in a time longer than our reaction time, we would have to use another source of information to interact with our environment.
If light were much faster, we might not even notice, since we rarely notice light travel time as it is.
If the speed were not constant - if, for example, it changed as frequency changed - then different colors of light would arrive at our eye at slightly different times. This would affect how we perceive color.
Due to the ability of light to travel through space, we can observe celestial objects that are too far away from us to gather information about them by any other means.
As light has the finite speed, it takes some time for stars' light to reach Earth. Therefore, light from any star can tell us only its past.
What things about celestial objects can light reveal to us?
distance |
space motion |
temperature |
chemical composition |
What effect does a positive charge have on a nearby negatively charged particle?
Positive and negative charges repel each other. |
Positive and negative charges attract each other. |
Positive and negative charges don’t interact. |
What effect does a positive charge have on a nearby positively charged particle?
Two positive charges don’t interact. |
Two positive charges repel each other. |
Two positive charges attract each other. |
Compared with ultraviolet radiation, infrared radiation has a greater
frequency. |
amplitude. |
energy. |
wavelength. |
A wavelength of green light is about the size of
atom. |
bacterium. |
fingernail. |
skyscraper. |
An X-ray telescope located in Antarctica would not work well because of
the extreme cold. |
the ozone hole. |
continuous daylight. |
Earth's atmosphere. |
The blackbody curve of a star moving toward Earth would have its peak shifted
toward longer wavelengths. |
to a higher intensity. |
to a lower intensity. |
toward higher energies. |
In Figure 3.11 in the textbook ("Multiple Blackbody Curves"), an object at 1000 K emits mostly
infrared light. |
red light. |
multiple green light. |
blue light. |
According to Wien's law, the hottest stars also have
the largest diameters. |
the longest peak wavelength. |
the shortest peak wavelength. |
maximum emission in the infrared region of the spectrum. |
Stefan's law says that if the Sun's temperature were to double, its energy emission would
become half its present value. |
double. |
increase four times. |
increase 16 times.  |
NoteStudied by 16 peopleNoteStudied by 53 peopleNoteStudied by 49 peopleNoteStudied by 21 peopleNoteStudied by 29 peopleNoteStudied by 10 people