The law stating that the rate of cooling of an object is directly proportional to the temperature difference between the object and the medium around it is known as [A] Newton's law of cooling. This principle, formulated by Sir Isaac Newton, describes how the temperature of an object changes over tiRead more
The law stating that the rate of cooling of an object is directly proportional to the temperature difference between the object and the medium around it is known as [A] Newton’s law of cooling. This principle, formulated by Sir Isaac Newton, describes how the temperature of an object changes over time as it loses heat to its surroundings. According to this law, the greater the temperature difference between the object and its surroundings, the faster the object will cool. Newton’s law of cooling is fundamental in various fields such as thermodynamics, heat transfer, and meteorology, providing a basis for understanding temperature changes in objects and environments. It is widely applied in practical scenarios, including engineering designs, climate modeling, and temperature control systems. Therefore, option [A] accurately represents the law concerning the cooling rate of objects.
The law stating that good emitters are good absorbers is known as [A] Kirchhoff's law. This principle, formulated by Gustav Kirchhoff, states that the efficiency of radiation emission and absorption at a specific wavelength is equal for a given material. It is a fundamental concept in thermodynamicsRead more
The law stating that good emitters are good absorbers is known as [A] Kirchhoff’s law. This principle, formulated by Gustav Kirchhoff, states that the efficiency of radiation emission and absorption at a specific wavelength is equal for a given material. It is a fundamental concept in thermodynamics and electromagnetic theory, applicable across various scientific disciplines. Kirchhoff’s law plays a crucial role in understanding the behavior of thermal radiation and the equilibrium between emission and absorption processes in materials. It has significant implications in fields such as astrophysics, spectroscopy, and thermal engineering. By establishing a relationship between emission and absorption properties, Kirchhoff’s law provides valuable insights into the thermal behavior of materials and electromagnetic radiation. Therefore, option [A] accurately represents the law that states “good emitters are good absorbers”.
The presence of humidity in the atmosphere can be ensured by observing water drops on the outer surface of a steel glass filled with [B] hot water. When hot water is poured into the steel glass, it warms the air inside, causing moisture in the air to evaporate. As the warm, moist air comes into contRead more
The presence of humidity in the atmosphere can be ensured by observing water drops on the outer surface of a steel glass filled with [B] hot water. When hot water is poured into the steel glass, it warms the air inside, causing moisture in the air to evaporate. As the warm, moist air comes into contact with the cooler surface of the steel glass, it cools down, leading to condensation of water vapor on the outer surface of the glass. This condensation forms droplets, indicating the presence of humidity in the surrounding air. Hot water provides the necessary warmth to generate sufficient moisture in the air for condensation to occur, making it an effective method for observing humidity. Therefore, option [B] is the correct choice for ensuring the presence of humidity.
Hot air produces more flame compared to boiling water, steam, or sun rays. When air is heated to high temperatures, it expands rapidly, becoming less dense and rising. This convection process is crucial in combustion, as it provides oxygen to support the burning of fuel. When combined with a fuel soRead more
Hot air produces more flame compared to boiling water, steam, or sun rays. When air is heated to high temperatures, it expands rapidly, becoming less dense and rising. This convection process is crucial in combustion, as it provides oxygen to support the burning of fuel. When combined with a fuel source, such as a flame or combustible material, the hot air facilitates and sustains combustion, resulting in the production of a visible flame. Boiling water and steam do not inherently produce flames as they are not involved in combustion processes. Sun rays, while capable of igniting certain materials under specific conditions, do not typically produce flames on their own. Therefore, hot air (option [C]) is the most likely to produce a flame when combined with a suitable fuel source.
Woolen clothes are warmer than cotton clothes primarily because they [D] are good insulators of heat. Wool fibers have natural properties that trap air pockets within the fabric, creating a barrier against heat loss. This insulation prevents body heat from escaping and external cold air from penetraRead more
Woolen clothes are warmer than cotton clothes primarily because they [D] are good insulators of heat. Wool fibers have natural properties that trap air pockets within the fabric, creating a barrier against heat loss. This insulation prevents body heat from escaping and external cold air from penetrating, effectively maintaining warmth. In contrast, cotton fibers lack the insulating properties of wool and do not trap air as effectively, making cotton clothes less suitable for retaining warmth. While woolen clothes may also be heavier than cotton clothes (option [C]), their superior insulation properties are what primarily contribute to their warmth. Options [A] and [B] are inaccurate as wool’s warmth is not due to its ability to absorb or distribute heat but rather its effectiveness as an insulator. Therefore, option [D] provides the most accurate explanation.
The rate of cooling of an object is directly proportional to the temperature difference between the object and the medium around it. This law is
The law stating that the rate of cooling of an object is directly proportional to the temperature difference between the object and the medium around it is known as [A] Newton's law of cooling. This principle, formulated by Sir Isaac Newton, describes how the temperature of an object changes over tiRead more
The law stating that the rate of cooling of an object is directly proportional to the temperature difference between the object and the medium around it is known as [A] Newton’s law of cooling. This principle, formulated by Sir Isaac Newton, describes how the temperature of an object changes over time as it loses heat to its surroundings. According to this law, the greater the temperature difference between the object and its surroundings, the faster the object will cool. Newton’s law of cooling is fundamental in various fields such as thermodynamics, heat transfer, and meteorology, providing a basis for understanding temperature changes in objects and environments. It is widely applied in practical scenarios, including engineering designs, climate modeling, and temperature control systems. Therefore, option [A] accurately represents the law concerning the cooling rate of objects.
See lessGood emitters are good absorbers. This law is
The law stating that good emitters are good absorbers is known as [A] Kirchhoff's law. This principle, formulated by Gustav Kirchhoff, states that the efficiency of radiation emission and absorption at a specific wavelength is equal for a given material. It is a fundamental concept in thermodynamicsRead more
The law stating that good emitters are good absorbers is known as [A] Kirchhoff’s law. This principle, formulated by Gustav Kirchhoff, states that the efficiency of radiation emission and absorption at a specific wavelength is equal for a given material. It is a fundamental concept in thermodynamics and electromagnetic theory, applicable across various scientific disciplines. Kirchhoff’s law plays a crucial role in understanding the behavior of thermal radiation and the equilibrium between emission and absorption processes in materials. It has significant implications in fields such as astrophysics, spectroscopy, and thermal engineering. By establishing a relationship between emission and absorption properties, Kirchhoff’s law provides valuable insights into the thermal behavior of materials and electromagnetic radiation. Therefore, option [A] accurately represents the law that states “good emitters are good absorbers”.
See lessThe presence of humidity in the atmosphere is ensured by observing water drops on the outer surface of a steel glass, which be filled with
The presence of humidity in the atmosphere can be ensured by observing water drops on the outer surface of a steel glass filled with [B] hot water. When hot water is poured into the steel glass, it warms the air inside, causing moisture in the air to evaporate. As the warm, moist air comes into contRead more
The presence of humidity in the atmosphere can be ensured by observing water drops on the outer surface of a steel glass filled with [B] hot water. When hot water is poured into the steel glass, it warms the air inside, causing moisture in the air to evaporate. As the warm, moist air comes into contact with the cooler surface of the steel glass, it cools down, leading to condensation of water vapor on the outer surface of the glass. This condensation forms droplets, indicating the presence of humidity in the surrounding air. Hot water provides the necessary warmth to generate sufficient moisture in the air for condensation to occur, making it an effective method for observing humidity. Therefore, option [B] is the correct choice for ensuring the presence of humidity.
See lessWhich of the following produces more flame?
Hot air produces more flame compared to boiling water, steam, or sun rays. When air is heated to high temperatures, it expands rapidly, becoming less dense and rising. This convection process is crucial in combustion, as it provides oxygen to support the burning of fuel. When combined with a fuel soRead more
Hot air produces more flame compared to boiling water, steam, or sun rays. When air is heated to high temperatures, it expands rapidly, becoming less dense and rising. This convection process is crucial in combustion, as it provides oxygen to support the burning of fuel. When combined with a fuel source, such as a flame or combustible material, the hot air facilitates and sustains combustion, resulting in the production of a visible flame. Boiling water and steam do not inherently produce flames as they are not involved in combustion processes. Sun rays, while capable of igniting certain materials under specific conditions, do not typically produce flames on their own. Therefore, hot air (option [C]) is the most likely to produce a flame when combined with a suitable fuel source.
See lessWoolen clothes are warmer than cotton clothes because
Woolen clothes are warmer than cotton clothes primarily because they [D] are good insulators of heat. Wool fibers have natural properties that trap air pockets within the fabric, creating a barrier against heat loss. This insulation prevents body heat from escaping and external cold air from penetraRead more
Woolen clothes are warmer than cotton clothes primarily because they [D] are good insulators of heat. Wool fibers have natural properties that trap air pockets within the fabric, creating a barrier against heat loss. This insulation prevents body heat from escaping and external cold air from penetrating, effectively maintaining warmth. In contrast, cotton fibers lack the insulating properties of wool and do not trap air as effectively, making cotton clothes less suitable for retaining warmth. While woolen clothes may also be heavier than cotton clothes (option [C]), their superior insulation properties are what primarily contribute to their warmth. Options [A] and [B] are inaccurate as wool’s warmth is not due to its ability to absorb or distribute heat but rather its effectiveness as an insulator. Therefore, option [D] provides the most accurate explanation.
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