Physics- Chapter 27; LIGHT
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Light does not pass through what kind of materials?
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Opaque
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Light waves are...
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Transverse waves
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Solar eclipses are seen less commonly the lunar eclipse is because
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Earth's shadow on the moon is larger than the moon's shadow on the earth
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Which electromagnetic wave has the shortest wavelength
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X-rays
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Glasses transparent to visible light, but not to
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Infrared AND Ultraviolet
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The shadow produced by an object held close to a piece of paper in sunlight will be
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Sharp
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Electromagnetic waves with higher frequencies have wavelengths that are
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Shorter
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What is the frequency of an electromagnetic wave having a wavelength of 300,000 KM?
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1 HZ
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Compared to the velocity of radio waves the velocity of visible light waves is
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The same
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Like that reflects at glancing angles from nonmetallic surfaces, such as glass, water, roads is
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Polarized parallel to the surface
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If the sun were to disappear right now, we wouldn't know about it for eight minutes because it takes eight minutes
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For like to travel from sun to earth
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Light reflected from a lake surface is polarized
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Horizontally
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Compared to the wavelength of UV waves, the wavelength of infrared waves is
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Longer
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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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The main difference between a radiowave in a white wave is it's
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Wavelength
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The shiny surfaces of metals have most to do with
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The free electrons in metal Atoms
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After randomly polarized light passes through A polarizer, it is
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Totally polarized
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An ideal polarizing filter will transmit 50% of non-polarized light incident on it. How much light is transmitted by two identical polarizing filters that are oriented with their axes parallel to each other
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50%
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The source of all of the electromagnetic waves is
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Vibrating charges
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Electromagnetic waves are
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Transverse waves
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What is the wavelength of an electromagnetic wave that has a frequency of one Hz
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More than 1 m
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The main difference between a radiowave in a soundwave is its
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Basic nature
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Heat lamps give off mostly
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Infrared waves
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How far is a light second
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300,000 km
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The primary purpose of polarized sunglasses is
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To block glare from reflections
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If two polarizing filters are held with their polarized nation exes at right angles to each other, the amount of light transmitted compared to when their axes are parallel is
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Zero
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Which of the following are fundamentally different from the others? Xrays Radio waves Sound waves Light waves Gamma rays
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Soundwaves
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Because of absorption, a polarizing filter will actually transmit 40% of incident non-polarized light. Two polarizing filters with their axis aligned will transmit
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Between 0% and 40%
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Which of the following is not an electromagnetic wave X-ray Sound Radio Infrared Light
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Sound
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Compared to its feet in the air, the speed of light and water is
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Slower
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When Romer took measurements of one of Jupiter's moons IO moving behind Jupiter, hefound his predicted time was off. Compared to when earth was closest to IO , the predicted times when earth was farthest from IO were
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Late
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Clouds (do what)
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Transmit UV light
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What is the ultimate source of electromagnetic waves
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Vibrating charged particles
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Electromagnetic waves can...
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Can travel through a vacuum
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Write a short paragraph on early measurements of the speed of light
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Olas Romer conducted experiments with Jupiters Moon IO Albert Michelson used revolving mirrors
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Which which are part of the electromagnetic spectrum what are their approximate frequencies give examples of where you can find each wave
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Radio waves, microwaves, infrared waves, visible light, ultraviolet rays, x-rays, gamma rays 10^6 , 10^10 , 10^14 , 10^14 , 10^16 , 10^17 , 10^18 Radios waves are used in radio broadcast towers, microwaves in microwaves, infrared visible and UV waves are found in sunlight. And x-rays are found in medical laboratories. Gamma rays are emitted by nuclear reactions
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For the short paragraph on polarize Asian, explain what it is and how we use it. Explain my sunglasses polarized light vertically
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A polarizer is a material that absorbs electromagnetic radiation and passes only radiation that is vibrating in a certain plane By using sunglasses that allow only vertically polarized light to pass we reduce the amount of light entering our eyes Large amount of reflected light is horizontally polarized sunglasses help reduce the glare
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Explain how late is transmitted through glass. Why is UV radiation not transmitted through glass
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In class late is transmitted by molecules, the molecules swallow or absorb the light and then burp or reemit the light in the same direction as its original traveling direction. This continues until the light reaches the other side of the glass Would you VG there are too many collisions in the process of passing on the energy therefore the energy is transmitted as he instead of light glass is not transmitted to UV radiation
