Atomic hydrogen is allowed to combine on the surface to be welded to generate the temperature of
a)400K
b)3000K
c)4600K
d)4000K

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Solution

There are two types of hydrogen torches used in the welding machines. In the first case the hydrogen gas is burned with oxygen gas to reach the temperature of around 2800K. But when atomic hydrogen produced by Irvin Langmuir method is allowed to combine in the metal surface it will produce a lot of heat. The temperature of the process will reach 4000K. So the option is (d)

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10.2 e V

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