assessment criteria 5 and 6 The Photoelectric effect‚ and the Production of Light In 1887 Hertz discovered the photoelectric effect‚ where electrons were emitted from a zinc surface when illuminated with ultra-violet light. These electrons (called ‘photoelectrons’) were only emitted when the frequency of the ultra-violet light was above a certain value (called the ‘threshold frequency’). Criteria 5c Assume that ultra-violet light is falling onto a piece of zinc‚ and photoelectrons are being emitted
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that played an important part in this production was the lighting. The Lighting crew put an old light fixture in the middle of the room of the set. One light worked and there was one blown out. This gave the audience an even better idea of the characters and their life. The one working light bulb showed the economic stature of the two brothers. Also‚ there were breaks in the scenes where the lights would go out for the characters to leave the stage and get prepared.
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The Effect of Light Intensity The effect of different light wavelengths was tested in the following experiment. The rate of photosynthesis can be affected depending on the light treatment it receives. With the aid of DPIP acting as NADPH in photosynthesis‚ it was possible to observe the reaction as it took place. Samples were created with dark‚ 24 cm‚ 30 cm‚ and 49 cm light treatments. The absorbance was measured in five-minute intervals for each sample and recorded in an appropriate table
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because blue light has a higher absorbance by plant photosynthetic pigments and has a higher energy wavelength than red light‚ we predicted that juniper needles placed in blue light would photosynthesize faster than juniper needles placed in red light. We measured the rate of change in CO2 concentration due to juniper needles. For each sample‚ we placed the needles into a chamber connected to the CO2 monitor and measured the rate of change of CO2 concentration for 10 minutes under red light and then
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disadvantages of a light microscope and electron microscope? Some of the disadvantages of the light microscope include‚ that since it send light‚ the light waves are diffracted as they pass through the matter. Because of this‚ light microscopes can only produce clear images of objects to a magnification of about 1000 times. Another problem is that since most living cells are nearly transparent‚ you can’t see them. So you have to use dyes to stain them. The advantage of using a light microscope however
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In Joseph Conrad’s Heart of Darkness‚ the juxtaposition of light and dark -- in addition to an abundance of imagery-- serves as a vehicle to understanding Conrad’s tainted view of humanity as deeply flawed. There are reoccurring light and dark images which symbolize the good and evil in mankind. Light represents both goodness and civilized Europe. Ironically‚ the light Europe is the place where the worst people are. Europeans are civilized‚ but inhumane. In contrast the references to darkness symbolize
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that particular Sunday evening. The climbers‚ John and Mary had reached the tops of the cliffs as the sun was setting. They looked over the town to one side and the water on the other. The whole scene appeared strikingly beautiful in the late evening light‚ for it was sunset. Their hearts began to fill with emotions as the vast open sky started to turn from a baby blue to an autumn red‚ the clouds changed from cotton white to a flaming yellow orange giving the clouds a fluorescent
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was a never-ending one. Throughout the novel‚ Hawthorne uses the symbols of light and dark to depict this battle among the characters Hester Prynne‚ Pearl‚ and Roger Chillingworth. <br> <br>After Hester commits her sin‚ her beauty almost immediately vanishes into darkness. Her hair no longer hangs freely about her face‚ instead she ties it up in a bonnet. Hester is not perceived as an evil person‚ but her sin makes her "light" hide away. The sun is used as a descriptor of the goodness or pure nature
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fluorescent light and why ultraviolet light is required to visualise it. (5 marks) When GFP is hit with UV light‚ the chromophore is hit by a photon. This changes the chromophore from ground state (A) to A*‚ which is a highly excitable state. Due to such a highly excitable state not being able to remain so for very long‚ the A* state chromophore emits a proton‚ lowering its state to I*‚ the energetic I. This I* state chromophore lowers its energy by emitting a photon of green light‚ lowering its
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GLENDA MARIE GARCIA POLARIZED LIGHT LAB REPORT EXPERIMENT # 5 June 27‚ 2014 PHYS 1417 ABSTRACT Ordinary light such as that from a light bulb is a form of wave motion that consists of electrical and magnetic fields that vibrate at right angles to the direction of travel of a light beam. Light waves that vibrate in a single plane are called polarized light waves. Such waves can be produced by passing light through polarizing filters. The experiment conducted was composed of crossed
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