A scientist wants to explain the behavior of electromagnetic radiation which allows it to move through space. Which explanation could the scientist use?(1 point)
Responses
The wave model explains this behavior because waves have well-defined positions.
The wave model explains this behavior because waves have well-defined positions.
The particle model explains this behavior because particles have well-defined positions.
The particle model explains this behavior because particles have well-defined positions.
The particle model explains this behavior because particles can move without a medium. Therefore, they can move through space,
The particle model explains this behavior because particles can move without a medium. Therefore, they can move through space,
The wave model explains this behavior because waves can move through space without needing a medium.
The wave model explains this behavior because waves can move through space without needing a medium.
A student observes that in the photoelectric effect, photons need to have well-defined energies in order to move electrons. Which statement is correct about this explanation? (1 point)
Responses
Either a particle model or a wave model of electromagnetic radiation can sufficiently explain the photoelectric effect.
Either a particle model or a wave model of electromagnetic radiation can sufficiently explain the photoelectric effect.
A wave model of electromagnetic radiation can sufficiently explain the photoelectric effect.
A wave model of electromagnetic radiation can sufficiently explain the photoelectric effect.
A particle model of electromagnetic radiation can sufficiently explain the photoelectric effect.
A particle model of electromagnetic radiation can sufficiently explain the photoelectric effect.
Neither a particle model nor a wave model of electromagnetic radiation can sufficiently explain the photoelectric effect.
A particle model of electromagnetic radiation can sufficiently explain the photoelectric effect.
A student explains that she can measure a well-defined frequency for radio waves. Therefore, she says that the wave model accurately predicts the behavior of radio waves. What other evidence supports using the wave model but not the particle model to characterize radio waves?(1 point)
Responses
They transport energy from one location to another.
They transport energy from one location to another.
They carry different amounts of energy than other forms of EM waves.
They carry different amounts of energy than other forms of EM waves.
They can travel through matter but not through a vacuum.
They can travel through matter but not through a vacuum.
They are generated by accelerating charged particles.
They transport energy from one location to another.
On a summer day, you feel the warmth of electromagnetic radiation from the sun. Which statement explains the type of model that best describes this phenomenon?(1 point)
Responses
The particle model is best because the radiation travels through empty space.
The particle model is best because the radiation travels through empty space.
The wave model is best because the radiation cannot travel through matter.
The wave model is best because the radiation cannot travel through matter.
The particle model is best because the radiation has a well-defined wavelength.
The particle model is best because the radiation has a well-defined wavelength.
The wave model is best because the radiation carries energy.
The wave model is best because the radiation carries energy.
A green laser pointer has a wavelength of 532 nanometers. Using the wave equation, what is the frequency of the light from the laser pointer?(1 point)
Responses
1.77×105 Hz
1.77×105 Hz
1.60×104 Hz
1.60×104 Hz
5.64×1014 Hz
5.64×1014 Hz
1.88×1014 Hz
To find the frequency of the light, we can use the equation:
c = λ * f
where:
c = speed of light = 3.00 x 10^8 m/s
λ = wavelength = 532 nm = 532 x 10^-9 m
f = frequency (what we want to find)
Rearranging the equation to solve for f:
f = c / λ
f = (3.00 x 10^8 m/s) / (532 x 10^-9 m)
f = 5.64 x 10^14 Hz
So, the frequency of the light from the laser pointer is 5.64 x 10^14 Hz.