1. Science
  2. Physics
  3. number 9 only please and if you can explain...

Question: number 9 only please and if you can explain...

Question details

0% 8. The filament temperature of an incandescent light bulb is 2000 K when the bulb delivers 40 W of power. What power is delivered if the temperature is increased to 2500 K? (Assume the emissivity remains constant.) A. 50 W B, 62 W C. 98 W D, 105 W E. 133W 9. Some insulating foam sheet measures 4 x 2 x 1.5 and has an R-value of 5.78 F-hrft2/BTU. what is the thermal conductivity of the foam A. K 00116 Wm-K B. K-00374 Wm K C. K = 0.0418 W/m-K D. K-0.0490 W/m-K E. 00521 Wm K

number 9 only please , and if you can explain it . Will thumps up answers

Solution by an expert tutor
Blurred Solution
This question has been solved
Subscribe to see this solution