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Why a candle flame burnns yellow, While ...

Why a candle flame burnns yellow, While a highly oxygenated gas - fuel flame burns blue?

Text Solution

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The most important factor determining colour of the flame is oxygen supply and the extent of fuel oxygen pre-mixing, which determines the rate of the combustion and thus the tempreture and reaction paths, there by producing different colours. In case of candle , it is an incomplete combustion and the yelloe flame, while a highly oxygenated gas flame burns blue of complete combustion raising a very high temperature.
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Abida and Ramesh were doing an experiment in which water to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame.whose water will get heated in a shorter time?

The image of candle flame placed at a distance of 40 cm from a spherical lens is formed on a screen placed on the other side of the lens at a distance of 40 cm from the lens. Identify the type of lens and write its focal length. What will be the nature of the image formed if the candle flame nature of the imge formed if the candle flame is shifted 25 cm towards the lens? Draw ray diagram to justify.

Knowledge Check

  • A candle flame gives

    A
    Line spectrum
    B
    Contin uous emission spectrum
    C
    Band spectrum
    D
    Continusous absorption spectrum

  • A candle flame gives

    A
    Line spectrum
    B
    Continuous emission spectrum
    C
    Band spectrum
    D
    Continuous absorption spectrum

  • A gas which burns with blue flame is :

    A
    `O_(2)`
    B
    `CO_(2)`
    C
    `N_(2)`
    D
    `CO`.

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    Make labelled diagram of candle flame.

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