A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using(a) Wien’s displacement law(b) Kirchoff’s law(c) Newton’s law of cooling(d) Stefan’s law
Answers
Answer:
A) Wien’s displacement law
Explanation:
According to Wien's displacemen law, when the temperature of a blackbody radiator increases, the overall radiated energy increases. The peak of the radiation curve also moves to a shorter wavelength. Thus, when the maximum is evaluated from the Planck radiation formula, the product of the peak wavelength and the temperature is found to be a constant. Wien's displacement law - λmT=b
Temperature and wavelength (colour) is related through wiens displacement law - λmT=b
Thus, the correct explanation for the above observation is possible by using Wien’s displacement law
Answer:
opt (a)
Explanation:
it states that product of wavelength of maximum intensity and temp is a constant.
As temp keeps on changing the wavelength also changes. As temp increased wavelength decreased.