Explain why:
a) In hot countries, houses are often painted white.
b) On a hot summer's day, the inside of a white car is cooler than a dark one.
c) If you use a lens to focus the Sun's rays on newspaper, the print burns more easily than the white paper.
Answers
Answer:
a) In places of hot climate, it is advised that the outer walls of house be painted white because white colour does not absorb any heat radiation from the sun which keep inside cool even if there is hot climate outside the house.
b) Because black absorbs heat more than a white car. This is why white car is cooler than black car.
Answer They reflect back some radiation and absorb very less radiation. White is a light colour. Hence, the walls of the house should be painted white to keep it cool from the inside.
Answer:
a) In hot countries, houses are often painted white because white are bad conductor of heat and absorb less heat.white colour does not absorb any heat radiation from the sun which keep inside cool.
b) On a hot summer's day, the inside of a white car is cooler than the dark one Because black colour absorbs more heat as compared to other colours. Same goes for clothing and other things. If your car is white than it will maintain it's inside temperature for a longer time as compared to black.
c) if you use lenses to focus the sun's rays on newspaper, the print burns more easily than the white paper because other colours absolves heat fastly then the white colour .