Question
In: Physics
A 100-W incandescent light bulb has a cylindrical tungsten filament 26.0 cm long, 0.35 mm in...
A 100-W incandescent light bulb has a cylindrical tungsten filament 26.0 cm long, 0.35 mm in diameter, and with an emissivity of 0.28.
(A) What is the temperature of the filament?
(B) For what wavelength does the spectral emittance of the bulb peak?
(C) Incandescent light bulbs are not very efficient sources of visible light. Explain why this is so.
Solutions
genius_generous answered 9 months agoRelated Solutions
An incandescent light bulb uses a coiled filament of tungsten that is 580 mm long with...
An incandescent light bulb uses a coiled filament of tungsten
that is 580 mm long with a diameter of 46.0 μm. At 20.0∘C tungsten
has a resistivity of 5.25×10−8Ω⋅m. Its temperature coefficient of
resistivity is 0.0045 (C∘)−1, and this remains accurate even at
high temperatures. The temperature of the filament increases
linearly with current, from 20∘C when no current flows to 2520∘C at
1.00 A of current. What is the resistance of the light bulb at
20∘C? What is the...
The length of a 60 W, 240 Ω light bulb filament is 60 cm.
The length of a 60 W, 240 Ω light bulb filament is 60 cm.
1.) Remembering that the current in the filament is proportional to the electric field, what is the current in the filament following the doubling of its length?
Express your answer using two significant figures.
2.) What is the resistance of the filament following the doubling of its length?
Express your answer using two significant figures.
A particular make of light bulb contains argon at 50 Torr and has a tungsten filament...
A particular make of light bulb contains argon at 50 Torr and
has a tungsten filament of radius 0.10mm and length 5.0cm. When
operating, the gas close to the filament has a temperature of about
1000°C. How many collisions are made with the filament in each
second.
Calculate the rate of energy emitted from an incandescent tungsten halogen light bulb as a function...
Calculate the rate of energy emitted from an
incandescent tungsten halogen light bulb as a function of
wavelength (W/m2 per µm versus wavelength in µm). Assume the
tungsten filament has a temperature of 3300 K.
c. What fraction of the total energy emitted by the bulb
produces light that we can see and what fraction is wasted as heat
(λ > 800 nm)?
d. Compare total area under your emissive power plot to
theoretical area. Given the total power emitted...
Please include diagrams: a) A 100-W light bulb and a 40-W light bulb are both rated...
Please include diagrams:
a) A 100-W light bulb and a 40-W light bulb are both rated at
household voltage. i) Which light bulb will be brighter if the two
bulbs are connected in parallel and this combination connected to a
household voltage source? ii) Which light bulb will be brighter if
they are connected in series and this combination connected to a
household voltage? b) A battery charges a parallel plate capacitor.
After it is fully charged, it is then...
compare the intensity of a 100 W light bulb while you are reading a book to...
compare the intensity of a 100 W light bulb while you
are reading a book to the intensity of the sun. what assumptions
were made ?
A long cylindrical rod of 100 mm radius consists of a nuclear material (k = 0.5...
A long cylindrical rod of 100 mm radius consists of a nuclear
material (k = 0.5 W/m-K) generating 24 kW/m3 uniformly throughout
its volume. The rod is enclosed within a tube having an outer
radius of 200 mm and a thermal conductivity of 4 W/m-K. The outer
surface is exposed to a convection environment at 100 C with a
convective heat transfer coefficient of 20 W/m2-k.
a) Calculate the heat rate per unit length being convected away
from the rod....
A long cylindrical rod of 100 mm radius consists of a nuclear material (k = 0.5...
A long cylindrical rod of 100 mm radius consists of a nuclear
material (k = 0.5 W/m-K) generating 24 kW/m3 uniformly throughout
its volume. The rod is enclosed within a tube having an outer
radius of 200 mm and a thermal conductivity of 4 W/m-K. The outer
surface is exposed to a convection environment at 100 C with a
convective heat transfer coefficient of 20 W/m2-k.
a) Calculate the heat rate per unit length being convected away
from the rod....
A cylindrical tube that is 2.20 m long and has a radius of 150 mm is...
A cylindrical tube that is 2.20 m long and has a radius of 150
mm is filled with water. It is oriented with its long central axis
vertical, and it is open to the air at the upper end. A hole 80.0
mm in radius is drilled in the bottom, and the water is allowed to
drain out. When the water level is half the height of the tube, (a)
what is the speed of the water exiting through the...
A 400-W cylindrical resistance heater is 1 m long and 0.5-cm-diameter. The resistance wire is placed...
A 400-W cylindrical resistance heater is 1 m long and
0.5-cm-diameter. The resistance wire is placed horizontally in a
fluid at 20◦C, flowing at a velocity of 20 m/s. Determine the outer
surface temperature of the resistance wire in steady operation if
the fluid is
(a) air and
(b) water. Ignore any heat transfer by radiation and evaluate
properties of air at 800 K and properties of water at 315 K.
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Consider a buffer system consisting of Benzoic acid (pKa = 4.20) and sodium benzoate, a) Would...
- Decision Variables S T Minimize 1.8S + 2.20T Subject to: Potassium 5S + 8T >= 200...
- A neurologist needs to counsel a stroke victim and her husband about possible outcomes, treatment options,...
- Case Study: Personal Beliefs in the Workplace Don Shakow was a prominent professional who worked in...
- 1: Competency framework usage is the modern best practice in management. What is meant by competency...
- A 19.34 g mixture of sugar (C12H22O11) and table salt (NaCl) is dissolved in 231 g...
- Young and Company claims that its pressurized diving bell will, on average, maintain its integrity to...
ADVERTISEMENT