Consider an incandescent lightbulb. If you wanted to turn a 10-W lightbulb into a 100-W lightbulb,...
Consider an incandescent lightbulb. If you wanted to turn a 10-W lightbulb into a 100-W lightbulb, how would you change the temperature of the filament inside the bulb?
a. Raise its temperature by a factor of 3.2.
b. Raise its temperature by a factor of 1.8.
c. Raise its temperature by a factor of 10.
d. Lower its temperature by a factor of 2.6.
e. Lower its temperature by a factor of 5.4.
Homework Answers
Answer is b. Raise its temperature by a factor of 1.8.
Since power radiated by light bulb is directly proportional to Temperature of light bulb to the power of 4.Therefore
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Consider an incandescent lightbulb. If you wanted to turn a 10-W
lightbulb into a 100-W lightbulb,...
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ans, 9.1 L = 0.848 m please answer in details i need help Question 9 - M2 (11 marks) An incandescent light bu...
ans,
9.1
L = 0.848 m
please answer in details i need help
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1. The filament of a standard 100-W light bulb has a resistance of about 100 ohms....
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Thank you! 7. Consider an antenna that radiates 100 W for a current lo = 2.0...
Thank you!
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when i turn it in i can only do handwritten. but if you can explain your...
when i turn it in i can only do handwritten. but if you can explain
your results from excel and how to calculate everything thats fine.
its due tomorrow please help!!
7. (1 mark) Complete the table below (where k is the true rate constant): Temperature 1/T In(k) (K) (K*') (units = ?) (unitless) 295.15 3.39x10 -3 .007914 M. - 4.839 303.15 3.30 x 10-3 -4860 mois -0.7215 ** 308.15 3.25 x 10-5 -4494 M's--0.7998 -|* | 313.15 3.19 x...
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Lightbulb A is rated at 120 V and 100 W for household applications. Lightbulb B is rated at 12 V and 100 W for automotive applications. Part A What is the current through each bulb? Express your answer using two significant figures. Enter your answers numerically separated by a comma. IVO AXO ? IA, IB = A Submit Request Answer Submit Part B What is the resistance of each bulb? Express your answer using two significant figures. Enter your answers...
ans,
9.1
L = 0.848 m
please answer in details i need help
Question 9 - M2 (11 marks) An incandescent light bulb is basically a resistor in an electrical circuit. The Tungsten wire filament acts as the resistor. Consider you connect an 60 Watt bulb to a 240V mains household electricity supply. 9.1) (4 marks) If the Tungsten filament is constrained to be of 15um diameter, how long does the Tungsten wire need to be to make the filament?...
1. The filament of a standard 100-W light bulb has a resistance of about 100 ohms. For this laboratory the glass of the light bulb is unfrosted, so that the filament can be viewed directly. The light bulb is connected to a variable AC voltage source (a Variac), which can deliver up to 140 volts AC. When the voltage is low, about 20 volts, the filament is a dull, red color. When the voltage is high, 100 V, how does...
5. Wien's Law and Stefan-Boltzmann Law A supergiant star has a surface T of 21,000 K. Its power output is 80,000 times that of the Sun; the Sun's power is 3.9 x1026 W. a. What is Amax for this supergiant star? b. What part of the electromagnetic spectrum is this? c. What is the radius of this supergiant, in meters? Treat it as a perfect black bod d. How many solar radii is this? y. An old-school lightbulb is about...
Thank you!
7. Consider an antenna that radiates 100 W for a current lo = 2.0 A. a. Calculate Rrad b. If the same antenna has an efficiency of 90%, calculate Ross C. How much power would be required from the power source to radiate 100 W? (assume good impedance matching) d. If the directivity of the antenna is 3.75, calculate the antenna gain, G.
when i turn it in i can only do handwritten. but if you can explain
your results from excel and how to calculate everything thats fine.
its due tomorrow please help!!
7. (1 mark) Complete the table below (where k is the true rate constant): Temperature 1/T In(k) (K) (K*') (units = ?) (unitless) 295.15 3.39x10 -3 .007914 M. - 4.839 303.15 3.30 x 10-3 -4860 mois -0.7215 ** 308.15 3.25 x 10-5 -4494 M's--0.7998 -|* | 313.15 3.19 x...
2. LRC series circuit. [10 pts.] Consider an LRC series circuit driven by an ac voltage source Vin Vo cos(wt). (a) Derive an expression for the real ac current in the circuit in terms of L, R, C, and a. (b) Determine the resonant frequency f, and angular frequency w, by direct differentiation of the current amplitude from part (a). Compare your result to LC (c) Determine the Q factor of this circuit in terms of L, R, and C....
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