The next four questions use this description. Our Sun has a peak emission wavelength of about 500 nm and a radius of about 700,000 km. Your dark-adapted eye has a pupil diameter of about 7 mm and can detect light intensity down to about 1.5 x 10-11 W/m². Assume the emissivity of the Sun is equal to 1. First, given these numbers, what is the surface temperature of the Sun in Kelvin to 3 significant digits? 5,796

Physics for Scientists and Engineers: Foundations and Connections
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ISBN:9781133939146
Author:Katz, Debora M.
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Chapter19: Temperature, Thermal Expansion And Gas Laws
Section: Chapter Questions
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The next four questions use this description.
Our Sun has a peak emission wavelength of about 500 nm and a
radius of about 700,000 km. Your dark-adapted eye has a pupil
diameter of about 7 mm and can detect light intensity down to
about 1.5 x 10-11 W/m². Assume the emissivity of the Sun is equal
to 1.
First, given these numbers, what is the surface temperature of the
Sun in Kelvin to 3 significant digits?
5,796
Transcribed Image Text:The next four questions use this description. Our Sun has a peak emission wavelength of about 500 nm and a radius of about 700,000 km. Your dark-adapted eye has a pupil diameter of about 7 mm and can detect light intensity down to about 1.5 x 10-11 W/m². Assume the emissivity of the Sun is equal to 1. First, given these numbers, what is the surface temperature of the Sun in Kelvin to 3 significant digits? 5,796
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Follow-up Question
To ignite a mixture of gasoline and air inside an internal combustion engine--like in your
car--a spark is generated by a high voltage across the spark plug, usually in the 10's of
thousands of volts, but the battery is only 12 V. This massive increase in voltage is
achieved through a transformer called the 'ignition coil'. A typical ignition coil has a primary
with 300 turns wrapped around a radius of 2 cm over a linear distance of 15 cm. The
secondary has 60,000 turns of wire over the same cylinder. The spark is generated when
the current is suddenly shut off to the coil. Assuming that the magnetic field is uniform
inside the primary and secondary coils, and that all of the magnetic field lines that go
through the primary go through the secondary, what voltage is generated in the secondary
coil if the current in the primary coil drops from 10 A to 0 A at a steady rate over the
course of 50 mirco-seconds? Give your answer to 2 significant digits.
Hint: Remember the definition of flux and how it can change, and remember how to
calculate the magnetic field of a coil of wire.
Typically, I'd walk you through a problem of this complexity; here I'm flexing your ability to
put multiple pieces together on your own.
Transcribed Image Text:To ignite a mixture of gasoline and air inside an internal combustion engine--like in your car--a spark is generated by a high voltage across the spark plug, usually in the 10's of thousands of volts, but the battery is only 12 V. This massive increase in voltage is achieved through a transformer called the 'ignition coil'. A typical ignition coil has a primary with 300 turns wrapped around a radius of 2 cm over a linear distance of 15 cm. The secondary has 60,000 turns of wire over the same cylinder. The spark is generated when the current is suddenly shut off to the coil. Assuming that the magnetic field is uniform inside the primary and secondary coils, and that all of the magnetic field lines that go through the primary go through the secondary, what voltage is generated in the secondary coil if the current in the primary coil drops from 10 A to 0 A at a steady rate over the course of 50 mirco-seconds? Give your answer to 2 significant digits. Hint: Remember the definition of flux and how it can change, and remember how to calculate the magnetic field of a coil of wire. Typically, I'd walk you through a problem of this complexity; here I'm flexing your ability to put multiple pieces together on your own.
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