An electric bulb has a filameent of surf...

An electric bulb has a filameent of surface area `20" cm"^(2)`. The filament is raised to a temperature of `1727^(0)C`, when a current passes through it. If Stefan.s constant is `5.7xx10^(-8)W//m^(2)k^(4)` and the emissivity of the filament is 0.5, the electric power being consumed to maintain this temperature is

456 W

45.6 W

912 W

91.2 W

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

TRANSMISSION OF HEAT
AAKASH SERIES|Exercise PRACTICE SHEET (EXERCISE-II) Thermal Conduction (LEVEL-II) More than One correct answer Type Questions|9 Videos
TRANSMISSION OF HEAT
AAKASH SERIES|Exercise PRACTICE SHEET (EXERCISE-II) Thermal Conduction (LEVEL-II) Linked Comprehension Type Questions (Passage-I)|2 Videos
TRANSMISSION OF HEAT
AAKASH SERIES|Exercise PRACTICE SHEET (EXERCISE-II) Thermal Conduction (LEVEL-I) Straight Objective Type Questions|18 Videos
TRANSMISSION OF HEAT
AAKASH SERIES|Exercise QUESTION FOR DESCRIPTIVE ANSWER|4 Videos
UNITS AND MEASUREMENT
AAKASH SERIES|Exercise Practice Exercise|45 Videos

Similar Questions

Explore conceptually related problems

A body having a surface area of 5.0" cm"^(2) , radiates 300 J of energy per minute at a temperature of 727^(@)C . The emissivity of the body is (Stefan.s constant =5.67xx10^(-8)W//m^(2)//K^(4) )

An incandescent light bulb has a tungsten filament that is heated to a temperature 3xx10^(3)K when an electric current passes through it. If the surface area of the filament is approximately 10^(-4)m^(2) and it has an emissivity of 0.32, the power radiated by the bulb is

The surface of a black body is at a temperature 727^(@)C and its cross-section is 1 m^(2) . Heat radiated from this surface in one minute in joules is (Stefan's constant = 5.7 xx 10^(-8) W//m^(2) // k^(4) )

AAKASH SERIES-TRANSMISSION OF HEAT-PRACTICE SHEET (EXERCISE-II) Thermal Conduction (LEVEL-II) Straight Objective Type Questions

A sphere and a cube both made of copper have equal volumes and are bla...
Text Solution
|
Energy is being emitted from the surface of a block body at 127^(0)C t...
Text Solution
|
An electric bulb has a filameent of surface area 20" cm"^(2). The fila...
Text Solution
|
The earth receives at its surface radiation from the sun at the rate o...
Text Solution
|
A hot body is placed in cooler surroundings. When the body temperature...
Text Solution
|
A body takes 8 minutes to cool from 90^(@) C to 80^(@)C in a surroundi...
Text Solution
|
A body cools from 70^(@)C to 50^(@)C in 5 minutes. Temperature of surr...
Text Solution
|
A body at 50^(@)C cools in a surroundings maintained at 30^(@)C. The t...
Text Solution
|
Two metallic spheres S(1) and S(2) made of same material have identica...
Text Solution
|
A black body of mass 34.38 gm and surface area 19.2" cm"^(2) is at an ...
Text Solution
|
A hot body placed in air is cooled down according to Newtons Law of co...
Text Solution
|
A highly conducting solid sphere of radius R, density rho and specific...
Text Solution
|
The emissive power of a black body at T = 300 K is 100W//m^(2). Consid...
Text Solution
|
A black body is kept in a hollow enclosure maintained at same temperat...
Text Solution
|
A block of ice is placed inside a closed room, then:
Text Solution
|
Which of the following curves represents spectral distribution of ener...
Text Solution
|
A thin wire of length l and surface area A is heated to a temperature ...
Text Solution
|
Three objects coloured black, grey and white can withstand hostile con...
Text Solution
|