Q. 115.0( 2 Votes )
Why is a white dress more comfortable than a dark dress in summer?
The comfort of wearing a white dress over a dark colored dress on a summer day is due to the difference in absorption of the sun’s light by different colors.
The light is an electromagnetic wave, that contains mass and energy. Based on the absorption of certain wavelengths of light energy source like Sun, objects will exhibit its color. A darker object is the one which absorbs all the colors (the wavelengths in the visible spectrum) of the light and a white object will reflect all the colors of the light.
Hence, a dark-colored dress will absorb all the visible wavelengths from the sun and this energy will get converted into heat energy. While in the case of a white dress, all the visible wavelengths are reflected from the dress causing effectively no absorption (in the ideal cases).
So, in the summer, as the radiation from the sun is higher, wearing a white dress will help to not absorb the energy but to reflect it, while a darker dress will absorb most of the radiation. Hence it would be more comfortable in a white dress on a summer day.
Rate this question :
Cloudy nights are warmer than the nights with clean sky. Explain.HC Verma - Concepts of Physics Part 2
Two identical metal balls one at T1 = 300 K and the other at T2 = 600 K are kept at a distance of 1m in vacuum. Will the temperatures equalize by radiation? Will the rate of heat gained by the colder sphere be proportional to as may be expected from the Stefan’s law?HC Verma - Concepts of Physics Part 2
On a cold winter night you are asked to sit on a chair. Would you like to choose a metal chair or a wooden chair? Both are kept in the same lawn and are at the same temperature.HC Verma - Concepts of Physics Part 2
On a hot summer day we want to cool our room by opening the refrigerator door and closing all the windows and doors. Will the process work?HC Verma - Concepts of Physics Part 2
Standing in the sun is more pleasant on a cold winter day than standing in shade. Is the temperature of air in the sun considerably higher than that of the air in shade?HC Verma - Concepts of Physics Part 2
The temperature of the atmosphere at a high altitude is around 500°C. Yet an animal there would freeze to death and not boil. Explain.HC Verma - Concepts of Physics Part 2
An ordinary electric fan does not cool the air, still it gives comfort in summer. Explain.HC Verma - Concepts of Physics Part 2
A heated body emits radiation which has maximum intensity near the frequency v0. The emissivity of the material is 0.5. If the absolute temperature of the body is doubled.HC Verma - Concepts of Physics Part 2
A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly.HC Verma - Concepts of Physics Part 2
Why does blowing over a spoonful of hot tea cools it? Does evaporation play a role? Does radiation play a role?HC Verma - Concepts of Physics Part 2