On the Celsius scale of temperature, absolute zero temperature is -273.15°C; option [D]. Absolute zero is the lowest possible temperature that can be theoretically reached, where particles of matter possess minimal thermal energy. At this temperature, the kinetic energy of particles is virtually nonRead more
On the Celsius scale of temperature, absolute zero temperature is -273.15°C; option [D]. Absolute zero is the lowest possible temperature that can be theoretically reached, where particles of matter possess minimal thermal energy. At this temperature, the kinetic energy of particles is virtually nonexistent, and molecular motion ceases. Absolute zero serves as the foundation for the Kelvin scale, where it is defined as 0 Kelvin (0 K). The Celsius scale, commonly used in everyday temperature measurements, aligns with the Kelvin scale such that the interval between each degree Celsius is equivalent to one Kelvin. Therefore, -273.15°C on the Celsius scale corresponds to 0 Kelvin on the Kelvin scale. Absolute zero has profound implications in physics, serving as a reference point for understanding the behavior of gases, quantum mechanics, and the concept of entropy. Achieving absolute zero in practice is extremely challenging, requiring sophisticated cooling techniques, but its theoretical significance remains fundamental in the study of thermodynamics and the behavior of matter at extremely low temperatures.
The correct answer is option D. Radiation pyrometers measure temperatures above 800°C. These devices operate based on the principle of detecting thermal radiation emitted by an object and converting it into a temperature reading. They are commonly used in industries such as metal processing, glass mRead more
The correct answer is option D. Radiation pyrometers measure temperatures above 800°C. These devices operate based on the principle of detecting thermal radiation emitted by an object and converting it into a temperature reading. They are commonly used in industries such as metal processing, glass manufacturing, and ceramics production, where temperatures often exceed 800°C. While other temperature ranges (options A, B, and C) may be measured by different types of thermometers, radiation pyrometers specifically target high-temperature applications. Therefore, option D, “Above 800 °C,” accurately represents the temperature range typically measured by radiation pyrometers, distinguishing them from thermometers designed for lower temperature ranges.
The correct answer is option C. Thermocouples are made by two dissimilar metals. These metals are joined at both ends to form two junctions. When there is a temperature gradient between the junctions, a voltage is generated due to the Seebeck effect. This voltage is proportional to the temperature dRead more
The correct answer is option C. Thermocouples are made by two dissimilar metals. These metals are joined at both ends to form two junctions. When there is a temperature gradient between the junctions, a voltage is generated due to the Seebeck effect. This voltage is proportional to the temperature difference and can be measured to determine temperature accurately. Therefore, option C, two dissimilar metals, accurately describes the composition of thermocouples, which utilize the thermoelectric effect to measure temperature differences. Options A and B are incorrect as thermocouples require dissimilar metals to function effectively, and option D is false as thermocouples are indeed made from two dissimilar metals.
The correct answer is option A. In cold countries, alcohol is preferred as a thermometer liquid instead of mercury because the melting point of alcohol can be lower. Mercury freezes at around -39°C, which can be exceeded in extremely cold climates, rendering mercury thermometers ineffective. AlcoholRead more
The correct answer is option A. In cold countries, alcohol is preferred as a thermometer liquid instead of mercury because the melting point of alcohol can be lower. Mercury freezes at around -39°C, which can be exceeded in extremely cold climates, rendering mercury thermometers ineffective. Alcohol, with a lower freezing point, remains liquid at lower temperatures, making it suitable for use in colder environments. Options B, C, and D are incorrect. Option B is false as alcohol is not a better conductor of heat compared to mercury. Option C is irrelevant to the choice of thermometer liquid. Option D is also irrelevant as the worldwide production of alcohol compared to mercury does not influence its suitability as a thermometer liquid in cold climates. Therefore, option A best explains why alcohol is preferred over mercury in cold countries.
The Sun's temperature is measured by; option [C] pyrometer thermometer. Pyrometers are specifically designed to measure high temperatures, making them suitable for determining the Sun's temperature. One common type of pyrometer used for solar temperature measurement is the optical pyrometer. OpticalRead more
The Sun’s temperature is measured by; option [C] pyrometer thermometer. Pyrometers are specifically designed to measure high temperatures, making them suitable for determining the Sun’s temperature. One common type of pyrometer used for solar temperature measurement is the optical pyrometer. Optical pyrometers determine temperature by comparing the brightness or color of the light emitted by the object being measured to that of a calibrated filament or standard light source. By adjusting the filament’s temperature until it matches the brightness or color of the Sun, the temperature of the Sun can be inferred. This method is based on the principles of blackbody radiation and Wien’s displacement law.
Another technique for measuring the Sun’s temperature involves using spectroscopy. Spectroscopic measurements analyze the Sun’s electromagnetic spectrum to determine its temperature based on the distribution of emitted radiation across different wavelengths. By examining spectral lines corresponding to various atomic or molecular transitions, scientists can derive the Sun’s temperature.
Both pyrometer-based methods and spectroscopic techniques provide valuable insights into the Sun’s thermal characteristics, contributing to our understanding of solar physics and astrophysics.
On the Celsius scale of temperature, absolute zero temperature is
On the Celsius scale of temperature, absolute zero temperature is -273.15°C; option [D]. Absolute zero is the lowest possible temperature that can be theoretically reached, where particles of matter possess minimal thermal energy. At this temperature, the kinetic energy of particles is virtually nonRead more
On the Celsius scale of temperature, absolute zero temperature is -273.15°C; option [D]. Absolute zero is the lowest possible temperature that can be theoretically reached, where particles of matter possess minimal thermal energy. At this temperature, the kinetic energy of particles is virtually nonexistent, and molecular motion ceases. Absolute zero serves as the foundation for the Kelvin scale, where it is defined as 0 Kelvin (0 K). The Celsius scale, commonly used in everyday temperature measurements, aligns with the Kelvin scale such that the interval between each degree Celsius is equivalent to one Kelvin. Therefore, -273.15°C on the Celsius scale corresponds to 0 Kelvin on the Kelvin scale. Absolute zero has profound implications in physics, serving as a reference point for understanding the behavior of gases, quantum mechanics, and the concept of entropy. Achieving absolute zero in practice is extremely challenging, requiring sophisticated cooling techniques, but its theoretical significance remains fundamental in the study of thermodynamics and the behavior of matter at extremely low temperatures.
See lessHow much temperature is measured by radiation pyrometer?
The correct answer is option D. Radiation pyrometers measure temperatures above 800°C. These devices operate based on the principle of detecting thermal radiation emitted by an object and converting it into a temperature reading. They are commonly used in industries such as metal processing, glass mRead more
The correct answer is option D. Radiation pyrometers measure temperatures above 800°C. These devices operate based on the principle of detecting thermal radiation emitted by an object and converting it into a temperature reading. They are commonly used in industries such as metal processing, glass manufacturing, and ceramics production, where temperatures often exceed 800°C. While other temperature ranges (options A, B, and C) may be measured by different types of thermometers, radiation pyrometers specifically target high-temperature applications. Therefore, option D, “Above 800 °C,” accurately represents the temperature range typically measured by radiation pyrometers, distinguishing them from thermometers designed for lower temperature ranges.
See lessThermocouple is made by
The correct answer is option C. Thermocouples are made by two dissimilar metals. These metals are joined at both ends to form two junctions. When there is a temperature gradient between the junctions, a voltage is generated due to the Seebeck effect. This voltage is proportional to the temperature dRead more
The correct answer is option C. Thermocouples are made by two dissimilar metals. These metals are joined at both ends to form two junctions. When there is a temperature gradient between the junctions, a voltage is generated due to the Seebeck effect. This voltage is proportional to the temperature difference and can be measured to determine temperature accurately. Therefore, option C, two dissimilar metals, accurately describes the composition of thermocouples, which utilize the thermoelectric effect to measure temperature differences. Options A and B are incorrect as thermocouples require dissimilar metals to function effectively, and option D is false as thermocouples are indeed made from two dissimilar metals.
See lessIn cold countries, alcohol is preferred as a thermometer liquid instead of mercury, because
The correct answer is option A. In cold countries, alcohol is preferred as a thermometer liquid instead of mercury because the melting point of alcohol can be lower. Mercury freezes at around -39°C, which can be exceeded in extremely cold climates, rendering mercury thermometers ineffective. AlcoholRead more
The correct answer is option A. In cold countries, alcohol is preferred as a thermometer liquid instead of mercury because the melting point of alcohol can be lower. Mercury freezes at around -39°C, which can be exceeded in extremely cold climates, rendering mercury thermometers ineffective. Alcohol, with a lower freezing point, remains liquid at lower temperatures, making it suitable for use in colder environments. Options B, C, and D are incorrect. Option B is false as alcohol is not a better conductor of heat compared to mercury. Option C is irrelevant to the choice of thermometer liquid. Option D is also irrelevant as the worldwide production of alcohol compared to mercury does not influence its suitability as a thermometer liquid in cold climates. Therefore, option A best explains why alcohol is preferred over mercury in cold countries.
See lessSun’s temperature is measured by
The Sun's temperature is measured by; option [C] pyrometer thermometer. Pyrometers are specifically designed to measure high temperatures, making them suitable for determining the Sun's temperature. One common type of pyrometer used for solar temperature measurement is the optical pyrometer. OpticalRead more
The Sun’s temperature is measured by; option [C] pyrometer thermometer. Pyrometers are specifically designed to measure high temperatures, making them suitable for determining the Sun’s temperature. One common type of pyrometer used for solar temperature measurement is the optical pyrometer. Optical pyrometers determine temperature by comparing the brightness or color of the light emitted by the object being measured to that of a calibrated filament or standard light source. By adjusting the filament’s temperature until it matches the brightness or color of the Sun, the temperature of the Sun can be inferred. This method is based on the principles of blackbody radiation and Wien’s displacement law.
See lessAnother technique for measuring the Sun’s temperature involves using spectroscopy. Spectroscopic measurements analyze the Sun’s electromagnetic spectrum to determine its temperature based on the distribution of emitted radiation across different wavelengths. By examining spectral lines corresponding to various atomic or molecular transitions, scientists can derive the Sun’s temperature.
Both pyrometer-based methods and spectroscopic techniques provide valuable insights into the Sun’s thermal characteristics, contributing to our understanding of solar physics and astrophysics.