Water in an electric kettle gets heated primarily due to conduction. The heating element transfers thermal energy directly to the water molecules upon contact. While convection and radiation may contribute minimally, the main mechanism responsible for heating water in an ...
Tiwari Academy Discussion Latest Questions
The Sun’s heat reaches the Earth primarily through radiation. Radiation involves the transfer of heat energy through electromagnetic waves, such as light and infrared radiation, traveling through the vacuum of space.
In the method of heat transfer known as radiation, a medium is not necessary. Radiation involves the transfer of heat energy through electromagnetic waves, such as light and infrared radiation, that can travel through a vacuum, such as space. Unlike ...
The method of heat transmission in which the particles of the medium do not move is conduction. Conduction involves the transfer of heat through direct contact between particles in a material medium.
The best conductor of heat among the options provided is mercury. Mercury is a metal with high thermal conductivity, efficiently transferring heat. In contrast, water, wood, and leather are poor conductors of heat.
The thermal conductivity of silver is greater than that of copper. Silver has a thermal conductivity of approximately 429 watts per meter Kelvin (W/mK), while copper’s thermal conductivity is about 401 W/mK.
A bolometer measures thermal radiation. It detects and quantifies infrared or heat radiation emitted by objects. By monitoring changes in electrical resistance when exposed to thermal radiation, bolometers determine radiation intensity. They are essential in various fields for precise measurement ...
A small space is left at the joint between two railway tracks because the metal expands when heated and contracts when cooled. This prevents the tracks from buckling in the heat or creating gaps in the cold, ensuring safe and ...
When the water on the surface of a lake is just about to freeze, the temperature of the water at the bottom of the lake will be 4°C. This is because water reaches its maximum density at 4°C and sinks ...
When water freezes due to cold in winter, fishes and other aquatic organisms can survive because only the upper layer of water freezes. This insulating ice layer keeps the water below from freezing, maintaining a habitable environment.