covers 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
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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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The Effect of Different Light Colours on Plant Growth Dianne R. Calub Marshela Alpha B. Gesmundo BS-Environmental Science Prof. Jayson Antonio Chemistry Department January 04‚ 2012 Abstract The goal of this study is to learn how the colour of light affects photosynthesis‚ to identify the effects of different coloured lights on plant growth‚ and to identify the potential use of different light colours as a growth regulator. An experiment was performed with the help of 7 students. Mustard
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be defined as light energy being converted into chemical energy‚ which is a very important process for plants and other organisms. Light can be described in terms of light quantity and light quality. Both of these have an affect on photosynthesis. The more light a plant absorbs the more the plant is able to photosynthesize. This light is absorbed though pigments which have specific interactions with certain light waves (colors). The goal of my first experiment was to test the effect that which different
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References: Birth: | February 11‚ 1847 in Milan‚ Ohio | | Death: | October 18‚ 1931 in West Orange‚ New Jersey | | Swan Electric Light Company Joseph Wilson Swan (1828-1914) was a physicist and chemist born in Sunderland‚ England
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Investigation of the effect of light intensity Equipment: * Data loga * Light sensor * Bulb * Metre ruler X3 Variables: Independent variable – distance of the light sensor from the light source (m) Dependant variable – intensity of light (lux) Control | Why it needs to be controlled? | How will you control it? | Bulb | There are different watts in different bulbs | Use the same bulb‚ but if your one does break half way through the experiment you can use another bulb with the
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Running head: NOISE POLLUTION PAGE 1 Noise pollution: Physical effects of noise pollution and governmental restrictions on it NOISE POLLUTION PAGE 2 Physical effects of noise pollution and governmental restrictions on it. “Pollution being the most
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converted into glucose‚ which can either be used in the cell for aerobic cellular respiration or other substances needed for growth. After the leaves of the seed are exposed to light‚ photosynthesis provides the seed with food and the food stores are no longer needed. In this research‚ the relationship between Mung bean light exposure and germination will be investigated. In order for germination to take place certain external factors are needed. Water must be available for the seed to hydrate
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AIR POLLUTION What is Air Pollution? Pollution is now a common place term‚ that our ears are attuned to. We hear about the various forms of pollution and read about it through the mass media. Air pollution is one such form that refers to the contamination of the air‚ irrespective of indoors or outside. A physical‚ biological or chemical alteration to the air in the atmosphere can be termed as pollution. It occurs when any harmful gases‚ dust‚ smoke enters into the atmosphere and makes it difficult
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Pollution and its types The term pollution refers to the act of contaminating ones environment by introducing certain hazardous contaminants that disturb the ecosystem and directly or indirectly affect the living organisms of that ecosystem. Pollution in general is the activity of disturbing the natural system and balance of an environment. The increase in the pollution over the years by man has caused severe damage to the earth’s ecosystem. It is responsible for global warming which is leading
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