By wein's displacement law we have
max
*T = 2898 um
max
= 2898/T
where T is in kelvin
max
= 2898/1000+273 = 2.27 um
max
= 2898 / 2000+273 = 1.27 um
when temperature is increases
so it will decrease but not quite halve
so option a) is the correct answer
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