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Why is it necessary to place all three thermometers the same distance from the light bulb?
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What are the raw materials that are necessary for photosynthesis to take place?
sun light soil water air
What is distance between mirror or lens and place where light rays meet?
Focal point
Why is it necessary to place a plant in dark before starting a experiment on photosynthesis?
Glucose formation take place efficiently in dark. This does not need light.
If you are four years away from a place would you be 4 light years away?
No, 'years' is a measure of time and 'light years' is a measure of distance.
What is the time required for an object when it is traveling at the speed of light?
Time required to do what? To move from one place to another, divide the distance by the speed of light.
What is a stevenson screen?
In observataries,the thermometers are kept in a wooden box with good ventilation and air movement.This box is called stevenson's screen
Where do plants get the energy necessary for the chemical reactions that take place during photosynthesis?
From the sun or other source of light. That is why it is called photosynthesis. Photo means light.
Why mercury is used in milk?
Mercury is highly poisonous and should not be used in milk production. The only place where mercury might be used in milk production is in mercury thermometers and where possible, these should be replaced with alcohol thermometers.
Why was a light year as the distance light travels in one year defined?
The light-year is the distance travelled by light in one year. Since the speed of light seems to be the speed limit in the Universe, it gives you an idea how long light takes, to travel from one place to another. If somebody says that Toliman is at a distance of 4.3 light-years, it means that light will take 4.3 years to travel from here to there, or from there to here. It also means that it isn't possible to reach Toliman in less than 4.3 years, however fast you go.
Why water is not used in place of mercury in thermometers?
For a start, water freezes at zero degrees, making it inappropriate for lower temperatures.
How should thermometer be maintained?
Many digital and infrared thermometers are self-calibrating.mercury thermometers should be shaken down prior to every use and left in place for at least three minutes. They require careful storage.and thorough cleaning after each use.
Whether the body temperature can be measured by keeping the thermometer at some place other than mouth?
Yes, you can measure body temperature by putting the thermometer under your arm (in which case it should measure below 36.5 degrees Celsius.) You can also get ear thermometers, but these work quite differently to regular oral/underarm thermometers. Forehead thermometers are also available.
