Share
Notifications

View all notifications

Cloudy Nights Are Warmer than the Nights with Clean Sky. Explain - Physics

Login
Create free account


      Forgot password?

Question

Cloudy nights are warmer than the nights with clean sky. Explain

Solution

During night, the earth's surface radiates infrared radiation of larger wavelength. Gas molecules in the air absorb some of this energy and radiate energy of their own in all directions. Also, water molecules, like the vapour that makes the clouds, absorb more frequencies of infrared energy than clear air does.
Both these factors contribute to the fact that clouds radiate more heat in all directions (including the earth) than clear air does. In turn, this makes the overall temperature on the earth warmer when there is a cloud cover. The heat energy radiated by the earth is reflected back to earth. Due to this, cloudy nights are warmer than the nights with clean sky.

  Is there an error in this question or solution?

APPEARS IN

 HC Verma Solution for Concepts of Physics - Vol. 2 (2018 to Current)
Chapter 6: Heat Transfer
Short Answers | Q: 10 | Page no. 97
Solution Cloudy Nights Are Warmer than the Nights with Clean Sky. Explain Concept: Heat Transfer - Radiation.
S
View in app×