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History Bookmarks Window Help 80% saplinglearning.com Jump to.. Print Calculator sel Periodic Table Question 12 of 12 Map. Openstax College Physics David Sana-Oronco at University of Tampa Suppose a gas-filled incandescent light bulb is manufactured so that the gas inside the bulb is at atmospheric pressure when the bulb has a temperature of 20.0 Find bulb when it is hot, assuming its hot temperature is 65.0 . Ignore the change of volume of the bulb due to an increase in temperature. Note that a light bulb is closed so the number of moles will not change. pressure inside such a Number Pa The actual final pressure of the light bulb will be different than calculated above because the glass bulb will actually expand. What will the final actual gauge pressure be, taking this expansion into account? The volume expansion coefficient for glass is 2.700 x 108 1 Number Pa Hint Previous Give Up & View Solution Check Answer Next Exit about us careers privacy policy terms of use contact us help

Explanation / Answer

P V = n R T

P / T = constant

(1 atm) / (273 + 20) = P / (273 + 65)

P = 1.154 atm

Gauge pressure = P - P_atm

= 0.154 atm

= 15562 Pa ..........Ans

Now V = V0 (1 + beta T)

V = V0 (1 + (2.700 x 10^-5)(65- 20)))

V = 1.001215 V0

P V / T = constant

(1 atm) (V0) / (273 + 20) = P (1.001215 V0) / (273 + 65)

P = 1.1522 atm

Gauge pressure = 0.1522 atm

= 15420 Pa .......Ans

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