During a hot day, it is comfortable if we wear black coloured clothes. (2024)

As an expert in physics and educational content, I bring a wealth of knowledge and experience to discuss the concepts presented in the article related to Byju's Answer for Standard VII Physics on Black-Body Radiation.

Black-Body Radiation is a fundamental concept in physics that deals with the electromagnetic radiation emitted by a perfect absorber and emitter of radiation, often referred to as a black body. A black body is an idealized object that absorbs all incident electromagnetic radiation, regardless of frequency or angle.

Now, let's break down the various concepts mentioned in the article:

1. Black-Body Radiation:

   • Black-Body Radiation is the electromagnetic radiation emitted by a perfect black body.
   • A black body is an object that absorbs all incident radiation and emits radiation at all frequencies.

2. Wearing Light Colored Clothes in Hot Weather:

   • The article mentions that on hot days, it is advised to wear light-colored clothes.
   • This is because light-colored clothes reflect most of the sunlight falling on them.
   • Dark-colored clothes, on the other hand, absorb most of the sunlight, making them less suitable for hot weather.

3. Painting Outer Walls of Houses White in Hot Climate:

   • The article poses a question about painting the outer walls of houses with white paint in hot climates.
   • The recommended practice is likely based on the same principle—white surfaces reflect more sunlight, helping to keep the building cooler.

4. Clothing Choice in Different Seasons:

   • The article touches upon the choice of clothing during different seasons.
   • In winter, people often wear woolen and dark-colored clothes to stay warm. This is because dark colors absorb and retain more heat.
   • In summer, wearing light-colored clothes is recommended for comfort as they reflect sunlight and do not absorb as much heat.

5. BNAT Exam for BYJU'S Scholarship:

   • The article briefly mentions the BNAT exam as a means to get a 100% scholarship for BYJU'S courses.
   • BNAT likely stands for BYJU'S National Aptitude Test.

In summary, the article discusses the principles of Black-Body Radiation, the effects of different colored surfaces on heat absorption and reflection, the choice of clothing based on weather conditions, and a scholarship exam (BNAT) offered by BYJU'S. These concepts align with fundamental physics principles and practical applications in daily life.