In winters, people wear jacket because ______
fabric of jacket is an insulator of heat so it traps body heat
In winter, it's important to preserve body heat to stay warm. Jackets are essential for this purpose because they are typically made from fabrics that act as insulators. An insulator is a material that slows down the transfer of heat. When you wear a jacket, the heat produced by your body is trapped inside, preventing it from escaping into the colder air outside. This trapping of heat helps to maintain a comfortable body temperature even in low external temperatures. Among the options provided, the most accurate reason people wear jackets in winter is: the fabric of jacket is an insulator of heat so it traps body heat.
A copper spoon is dipped in hot water. What happens to its other end?
A brass rod (thermal conductivity 109 J/s m K) has an area of cross section 0.04 m 2and length 20 cm. If the two end of the rod are maintained at a temperature difference of 200°C, the rate of heat flow through the rod is ________.
A black surface absorbs ________ as compared to a white surface, under identical conditions.
The process by which heat is transferred from the hotter end to the colder end of an object is known as ______.
If a liquid is heated in weightlessness the heat is transmitted through
An iron ball at 60°C is dropped in a mug containing water at 60°C. The heat will
The temperatures of two perfect black bodies A and B are 400 K and 200 K, respectively. If the surface area of A is twice that of B, the ratio of total power emitted by A to that by B is
The volume and temperature of a spherical cavity filled with black body radiation are V and 300 K, respectively. If it expands adiabatically to a volume 2V, its temperature will be closest to