Physics 1320 Chapter 26 – Flashcards
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how do the wavelength and frequency of infrared light compare to the wavelength and frequency of ultraviolet light?
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the wavelength of infrared is larger than that of ultraviolet, and the frequency is smaller
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how does frequency change when the wavelength is increased?
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the frequency decreases
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how does the speed of radio waves compare to the speed of gamma rays?
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the speed of radio waves is equal to the speed of gamma rays
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the electromagnetic waves having the highest speed in free space are
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none in particular, as gamma, radio, and light have the same speed
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the smallest portion of the electromagnetic spectrum is
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visible light
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materials that clearly transmit visible light are said to be
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transparent
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strictly speaking, the light that meets and passes through the pane of a window glass
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is not the same as the light that emerges
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the electromagnetic radiation mostly absorbed in ordinary glass is
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ultraviolet
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Materials that do not transmit visible light are said to be
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opaque
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a solar eclipse occurs when the shadow of the
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moon falls on the earths surface
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a helium-neon laser emits light of wavelength 633 nanometers (nm). Light from an argon laser has the wavelength of 515 nm. Which laser emits the higher-frequency light?
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an argon laser
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when we look at the sun, we are seeing it as it was 8 minutes ago. so we can only see the sun "in the past." when you look at the back of your hand, do you see it now or in the past?
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i see it "in the past"
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most of the waves in the electromagnetic spectrum are
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invisible
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electromagnetic waves are composed of
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electric and magnetic fields
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electromagnetic waves consist of
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oscillating electric and magnetic fields
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the main difference between a radio and a light wave is its
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-wavelength -frequency
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which of these electromagnetic waves has the shortest wavelength?
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X-rays
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compared to the ultraviolet waves, the wavelength of infrared waves is
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longer
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compared to radio waves, the velocity of visible light waves in a vacuum is
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the same
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if an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a
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frequency of 1000 Hz
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infrared waves are often called heat waves because
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they induce resonance in molecules and increase internal energy in a substance
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a lunar eclipse occurs when the
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moon passes into the earths shadow
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a solar eclipse occurs when the
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moons shadow touches earth
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a partial solar eclipse occurs for the people in the sun's
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penumbra
