A piece of iron is heated in a flame. It first comes dull red then becomes reddish

A Piece Of Iron Is Heated In A Flame It Physics QuestionA Piece Of Iron Is Heated In A Flame It Physics Question

A piece of iron is heated in a flame. It first comes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using

Options

(a) Wien’s displacement law
(b) Kirchoff’s law
(c) Newton’s law of cooling
(d) Stefan’s law

Correct Answer:

Wien’s displacement law

Explanation:

Wien’s displacement law, According to this law,
λmax ∞ 1 / T or λmax x T = constant. So, as the temperature increases λ decreases.

AddThis Website Tools
admin:

Related Questions

  1. The density of ice is 0.9 g/cc and that of sea water is 1.1 g/cc
  2. A body oscillates with amplitude of 10 cm in a horizontal platform.
  3. A coil of resistance 20 ohm and inductance 5H is connected with a 100V battery
  4. Two wheels having radii in the ratio 1:3 are connected by a common belt
  5. A ball is projected upwards from the foot of a tower. The ball crosses the top