The correct statement is [A] Absolute humidity is expressed in grams per cubic meter of air. Absolute humidity represents the actual amount of water vapor present in a unit volume of air, usually measured in grams per cubic meter (g/m³). This measurement provides a direct indication of the moistureRead more
The correct statement is [A] Absolute humidity is expressed in grams per cubic meter of air. Absolute humidity represents the actual amount of water vapor present in a unit volume of air, usually measured in grams per cubic meter (g/m³). This measurement provides a direct indication of the moisture content of the air, which is essential for various applications in meteorology, engineering, and agriculture.
Options B, C, and D are incorrect. Temperature generally decreases with altitude at a rate of approximately 9.8°C per 1000 meters (not 165 meters) due to the lapse rate in the Earth’s atmosphere (B). With an increase in air temperature, the capacity of air to hold moisture actually increases, not reduces (C). An increase in temperature typically leads to a decrease in air pressure, not the opposite (D).
The time taken for the hot water to cool from 80°C to 70°C will be more than 10 minutes. According to Newton's law of cooling, the rate of cooling is proportional to the temperature difference between the body and its surroundings. As the temperature difference decreases, the rate of cooling also deRead more
The time taken for the hot water to cool from 80°C to 70°C will be more than 10 minutes. According to Newton’s law of cooling, the rate of cooling is proportional to the temperature difference between the body and its surroundings. As the temperature difference decreases, the rate of cooling also decreases.
In the given scenario, the water cools from 90°C to 80°C in 10 minutes. This means the average temperature during this interval is 85°C, which is 60°C above the surrounding temperature. When the water cools from 80°C to 70°C, the average temperature is 75°C, which is 50°C above the surroundings. Since the temperature difference is lower, the rate of cooling will be slower, and it will take more than 10 minutes for the water to cool through this 10°C interval.
Therefore, the correct answer is [C] More than 10 minutes.
Newton's cooling law is applicable only when [A] the difference in temperature is not very much. This law describes the rate of cooling of an object in relation to the temperature difference between the object and its surroundings. It assumes that the temperature difference is small enough to maintaRead more
Newton’s cooling law is applicable only when [A] the difference in temperature is not very much. This law describes the rate of cooling of an object in relation to the temperature difference between the object and its surroundings. It assumes that the temperature difference is small enough to maintain a linear relationship between the rate of cooling and the temperature difference. However, if the temperature difference is very large, nonlinear effects such as convection currents and radiation become more significant, and Newton’s law of cooling may not accurately describe the cooling process. Therefore, it is most applicable when the temperature difference is relatively small, allowing for a linear approximation of the cooling rate. Options [B], [C], and [D] are incorrect as they do not accurately describe the conditions under which Newton’s cooling law applies.
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”.
Which of the following statements is correct?
The correct statement is [A] Absolute humidity is expressed in grams per cubic meter of air. Absolute humidity represents the actual amount of water vapor present in a unit volume of air, usually measured in grams per cubic meter (g/m³). This measurement provides a direct indication of the moistureRead more
The correct statement is [A] Absolute humidity is expressed in grams per cubic meter of air. Absolute humidity represents the actual amount of water vapor present in a unit volume of air, usually measured in grams per cubic meter (g/m³). This measurement provides a direct indication of the moisture content of the air, which is essential for various applications in meteorology, engineering, and agriculture.
Options B, C, and D are incorrect. Temperature generally decreases with altitude at a rate of approximately 9.8°C per 1000 meters (not 165 meters) due to the lapse rate in the Earth’s atmosphere (B). With an increase in air temperature, the capacity of air to hold moisture actually increases, not reduces (C). An increase in temperature typically leads to a decrease in air pressure, not the opposite (D).
See lessIf hot water takes 10 minutes to cool from 90°C to 80°C, then the time taken to cool from 80°C to 70°C is
The time taken for the hot water to cool from 80°C to 70°C will be more than 10 minutes. According to Newton's law of cooling, the rate of cooling is proportional to the temperature difference between the body and its surroundings. As the temperature difference decreases, the rate of cooling also deRead more
The time taken for the hot water to cool from 80°C to 70°C will be more than 10 minutes. According to Newton’s law of cooling, the rate of cooling is proportional to the temperature difference between the body and its surroundings. As the temperature difference decreases, the rate of cooling also decreases.
See lessIn the given scenario, the water cools from 90°C to 80°C in 10 minutes. This means the average temperature during this interval is 85°C, which is 60°C above the surrounding temperature. When the water cools from 80°C to 70°C, the average temperature is 75°C, which is 50°C above the surroundings. Since the temperature difference is lower, the rate of cooling will be slower, and it will take more than 10 minutes for the water to cool through this 10°C interval.
Therefore, the correct answer is [C] More than 10 minutes.
Newton’s cooling law is applicable only when
Newton's cooling law is applicable only when [A] the difference in temperature is not very much. This law describes the rate of cooling of an object in relation to the temperature difference between the object and its surroundings. It assumes that the temperature difference is small enough to maintaRead more
Newton’s cooling law is applicable only when [A] the difference in temperature is not very much. This law describes the rate of cooling of an object in relation to the temperature difference between the object and its surroundings. It assumes that the temperature difference is small enough to maintain a linear relationship between the rate of cooling and the temperature difference. However, if the temperature difference is very large, nonlinear effects such as convection currents and radiation become more significant, and Newton’s law of cooling may not accurately describe the cooling process. Therefore, it is most applicable when the temperature difference is relatively small, allowing for a linear approximation of the cooling rate. Options [B], [C], and [D] are incorrect as they do not accurately describe the conditions under which Newton’s cooling law applies.
See lessThe 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 less