On increasing the temperature of a substance gradually, which of the following colours will be noticed by you
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(a) White. The temperature of body is at $1600^{\circ} \mathrm{C}$
| Temp | Colour | Temp. | Colour |
| $525\circ C$ | Light red | $1200\circ C$ | Yellow |
| $900\circ C$ | Cherry red | $1300\circ C$ | Green |
| $1100\circ C$ | Orange red | $1600\circ C$ | White |
According to Wien's displacement law, $\lambda T=$ constant. For red, $\lambda$ is large sotemperature is less. For blue temperature is large accordingly.
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