Light Flashcards
All electromagnetic waves travel at the same speed in a vacuum, which is the speed of light.
true
Given the wave speed equation,
what is the relationship between frequency () and wavelength ()?
inverse
Refer to the table. Which color shown has the longest wavelength?
red
The frequency of electromagnetic radiation is measured in ________.
hertz
Which statement about electromagnetic radiation is False?
Visible light falls between gamma and X-rays on the electromagnetic spectrum
Which of the following is approximately equal to the currently accepted value for the speed of light?
3E8 m/s
In a vacuum, electromagnetic radiation of short wavelengths
travels as fast as radiation of long wavelengths
How does light travel?
All of the above
When a wave strikes an object and bounces off, ____________ occurs.
reflection
Waves that strike an object are called __________ waves or rays.
incident
According to the law of reflection, the angle of incidence is _____ the angle of reflection.
equal to
If a light ray hits a plane mirror at 46º. What is the angle of reflection?
46
What type of light reflection occurs when light is reflected from a rough, textured surface?
diffuse
A mirage is the result of
all of the above
Even when the sun has passed just below the horizon, we can still see the sun for a few more minutes because the sun’s light rays are _____ by the atmosphere.
refracted
A student puts a hand up in front of a plane mirror as shown. Four possible observations are shown in the table. Which observation in the table correctly describes the image of the hand?
student 4
Various wavelengths of incoming light are bent at different angles when they encounter a refracting medium. What is the name of this phenomenon?
dispersion
When white light passes through a prism, what color is bent most?
violet
When red light and blue light shine on the same place on a piece of white paper, the spot appears to be
magenta
When red light and green light shine on the same place on a piece of white paper, the spot appears to be
yellow
When blue light and yellow light shine on the same place on a piece of white paper, the spot appears to be
white
What is the function of a spectrometer?
to separate light from a source into its monochromatic components
When the light given off (emitted) by an atomic gas is passed through a prism, a series of distinct bright lines is seen. Each line corresponds to a different wavelength, or color, of light. Such a series of spectral lines is commonly referred to as a(n) _________________.
emission spectrum
Which elements are present in the mixture of unknown gases?
hydrogen and helium
Which elements are NOT present in the mixture of unknown gases?
lithium and sodium
When viewed from Earth, the light from very distant galaxies shows a red shift. This is evidence that these distant galaxies are -
moving away from earth
which diagram best represents the spectral lines of this element when its light is observed coming from a star that is moving away from earth?
d (the spectral lines are redshifted)
What is the best inference that can be made concerning the movement of galaxies A, B, and C?
d (galaxies A, B, and C are all moving away from earth)
the number of electrons being emitted from the surface depends on ——— of the light
intensity
the kinetic energy of electrons being emitted depends on the ——of light
frequency
the results of hertz’s examination of the photoelectric effect —— be explained by the classical theory of physics consisting of newtonian mechanics and maxwellian electromagnetism
cannot
einstein hypothesized that electromagnetic radiation can behave like
both a wave and a particle
what term refers to electromagnetic waves as particles
photons
the results of hertz’s examination of the photoelectric effect ——- be explained by einsteins photon theory which built upon plancks quantum theory
can
a quantum of energy is the minimum quantity of energy that can be lost or gained by an atom
true
the photoelectric effect helped prove that ligh
comes in packets called photons
the —— of a photon is zero
mass
in his ——- heisenberg argued that it is fundamentally impossible to make simultaneous measurements…
uncertainty principle
which of the following devices typically use the photoelectric effect to function?
solar panels, garage door opener, tv remote control
