All waves need some materials to travel through.
True
False
Electromagnetic radia...
All waves need some materials to travel through.
True
False
Electromagnetic radiation is
Energy that is created only by the Sun
Energy that is created by atoms and electricity
Energy that is electric and magnetic
Energy that is magnetic and solar
EM waves have crests, troughs, and wavelengths.
True
False
Radio waves:
Are the shortest waves in the EM spectrum
Need water to travel through
Are the longest waves in the EM spectrum
Carry the most energy in the EM spectrum
What does frequency mean?
How many waves or cycles exist at one time
How many waves or cycles pass a certain point in one minute
How many waves or cycles pass a certain point in one second
How many waves or cycles pass a certain point in one hour
A cycle measures:
1 point
How long the wavelength is
How much time it takes the wave to travel from its source to Earth
The number of waves passing a certain point in one second
A single wave from one crest or trough to the next
Another word for cycles per second is ___.
Hertz
Frequency
EM radiation
Waves
Which waves have the highest frequencies?
Microwaves
UV
Waves with the highest energy
Waves with the lowest energy
Radio waves are used for .
TV broadcasting
Cell phones
Pagers
All of the above
In general, if a wavelength is short, .
It tells us nothing about the energy and frequency
The energy and frequency are medium
The energy and frequency are high
The energy and frequency are low
Answers: 1
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What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.
Answers: 1
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Atelevision set that has been running for a while heats up even the air around it. which two laws of thermodynamics could be used to analyze this scenario
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Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.
Answers: 1
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Athird point charge q3 is now positioned halfway between q1 and q2. the net force on q2 now has a magnitude of f2,net = 5.861 n and points away from q1 and q3. what is the value (sign and magnitude) of the charge q3?
Answers: 2
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