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Suppose there are two stars A and B with the same luminosity. If star A is larger then star B then we can conclude that?
A The temperature of star B is lower B The temperature of star A is lower C Star A is more massive D Star B is more massive E Not enough information to conclude anything
Does Rigel have a higher luminosity and a lower surface temperature than the sun?
Yes, Rigel has a much higher luminosity than the Sun, being around 120,000 times more luminous. However, it also has a lower surface temperature than the Sun, with a surface temperature of around 11,000 Kelvin compared to the Sun's temperature of approximately 5,500 Kelvin.
Would the sun be more luminous if it had the same surface temperature but were more massive?
No, the luminosity of a star depends on both its surface temperature and its mass. Increasing the mass of the Sun while keeping its surface temperature the same would actually cause it to be more luminous due to increased gravitational energy being converted into light.
Are the hottest main sequence starts also the most massive?
Yes, generally the hottest main sequence stars are also the most massive. This is because more massive stars have higher core temperatures and pressures, resulting in hotter surface temperatures. Therefore, there is a direct correlation between a star's mass and its surface temperature on the main sequence.
How can a red giant become brighter if it now has a lower surface temperature?
A red giant can become brighter if its core temperature increases due to increased fusion reactions. Even though the surface temperature decreases, the overall luminosity of the star can increase if the core fusion rate intensifies, producing more energy.
Suppose there are two stars A and B with the same luminosity. If star A is larger then star B then we can conclude that?
A The temperature of star B is lower B The temperature of star A is lower C Star A is more massive D Star B is more massive E Not enough information to conclude anything
Compared to less massive particles at the same temperature more massive particles?
Compared to less massive particles at the same temperature, more massive particles have lower average speeds due to their higher inertia. This results in more frequent collisions with other particles, leading to increased pressure in a gas.
How does the dilation of blood vessels in the skin help to lower the temperature of the skin surface?
When blood vessels in the skin dilate, more blood flows to the skin's surface, allowing heat to escape from the body more easily. This process helps to lower the temperature of the skin surface.
How can you lower the temperature at which evaporation takes place?
To lower the temperature at which evaporation takes place, you can decrease the pressure or increase the surface area of the liquid. This allows the liquid molecules to escape into the air more easily, leading to evaporation at a lower temperature.
Does Rigel have a higher luminosity and a lower surface temperature than the sun?
Yes, Rigel has a much higher luminosity than the Sun, being around 120,000 times more luminous. However, it also has a lower surface temperature than the Sun, with a surface temperature of around 11,000 Kelvin compared to the Sun's temperature of approximately 5,500 Kelvin.
Would the sun be more luminous if it had the same surface temperature but were more massive?
No, the luminosity of a star depends on both its surface temperature and its mass. Increasing the mass of the Sun while keeping its surface temperature the same would actually cause it to be more luminous due to increased gravitational energy being converted into light.
Surface tension of water at different temperatures?
Surface tension of water decreases as temperature increases. At lower temperatures, water molecules are more closely packed, leading to stronger intermolecular forces and higher surface tension. As temperature rises, water molecules gain kinetic energy and move more freely, causing weaker intermolecuar attractions and lower surface tension.
Why is the temperature needed to freeze ocean water lower than the temperature needed to freeze the surface of a fresh lake?
The ocean is larger than a lake. Therefore, being larger it can absorb more heat. That is why a lower temperature is needed to freeze it.
Why is the temperature needed to freeze ocean water lower than the temperature needed to freeze a surface of a fresh water lake?
The ocean is larger than a lake. Therefore, being larger it can absorb more heat. That is why a lower temperature is needed to freeze it.
Are the hottest main sequence starts also the most massive?
Yes, generally the hottest main sequence stars are also the most massive. This is because more massive stars have higher core temperatures and pressures, resulting in hotter surface temperatures. Therefore, there is a direct correlation between a star's mass and its surface temperature on the main sequence.
What is the color of stars that have a surface temperature of 3000 degrees celsius?
Stars with a surface temperature of around 3000 degrees Celsius appear red in color. This is because their lower temperature causes them to emit more red and infrared light compared to higher temperature stars.
How does changing a planet's albedo change a planet's temperature?
If you increase the albedo, more solar radiation will be reflected back into space and so the temperature will be lowered.
