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20 Cards in this Set
- Front
- Back
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What happens when light is diffracted?
What are the types of diffraction? |
The light bends as it passes gap
Constructive & destructive (In phase - sum / anti phase - cancellation) |
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Why can light travel in space?
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Light is a self propagated wave.
It doesn't need a medium to travel through, like sound needs air to travel. |
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What is a wavelength?
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distance between 2 successive troughs/crests of a wave
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What is a frequency?
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Number of wave crests that pass a given point in 1 second
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What is the equation to convert wavelength to frequency?
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c = v(lambda)
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A short wavelength is equal to what kind of frequency? A long wavelength?
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Short wavelength = big frequency
Long wavelength = small frequency |
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What is the equation for the energy of light waves? What do its components represent?
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E = hv
E - Energy (ergs) h - Planck's constant v - Frequency |
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In the equation E=hv, a high frequency of light would mean what for the wavelengths and energy?
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High frequency of light = low wavelengths = high energy
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Why is light considered a form of radiation?
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Because it has a frequency and energy.
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What are the 6 wavelengths ranges (colors) shown from a prism when light is shined through it? List them from more energetic to less energetic.
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Violet, blue, green, yellow, orange, red
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Which wavelength (color) bends the least?
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Red
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What are the 6 forms of radiation? List them from highest frequency to lowest.
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Radio, Infrared, Visible, Ultraviolet, X-ray, Gamma Ray
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Which form of radiation has the highest wavelength?
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Gamma rays
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How hot will an object be if it has shorter wavelengths?
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Hotter
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What are the characteristics of a perfect black body?
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Absorbs all energy. Remits all radiations, NO reflection.
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What does Wein's Law calculate? What is the equation?
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The temperature of an object by intensity of light at particular wavelengths
(lambda)peak = (2.898x10^-3)/ T (K) |
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How do you measure the temperature on a Black Body Curve? What other indicator can help tell the temperature of an object?
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Measure the peak of the curve.
The color is also an indicator |
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What can be said about the hotter temperatures?
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The are more intense, brighter, at ALL wavelengths
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Explain a blue shifted wavelength. What can be said about the wavelengths and its frequencies?
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Blue shifted wavelength is moving TOWARDS you
Wavelengths = smaller Frequency = larger |
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Explain a red shifted wavelength. What can be said about the wavelengths and its frequencies?
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Red shifted wavelengths are moving AWAY
Wavelength = longer Frequency = smaller |
