Related Questions

Consider the following statements.
An ordinary light bulb has a rather short life because the
1. Filament wire is not uniform.
2. Bulb cannot be evacuated completely.
3. Wires supporting the filament melt at high temperatures.
Which of the above statements are correct?
Which of the following statements is/ are correct?
1. Uniform silk yarns are more suitable for weaving on high speed looms than hand reeled silk yarns.
2. Reeling or unwinding the filament from the cocoon is done in an establishment called a filature.
3. Doupion silk comes from two silk worms who spin their cocoon together.
4. Reeled silk or Gandhi Ashram silk is a long continuous filament 300-1600 yards in length.
Selects the correct answer
A 100 W light bulb has a tungsten filament (emissivity = 0.30) which is required to operate at 2780 K. If the bulb is completely evacuated, calculate the minimum surface area of the tungsten filament
The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is
The temperature of a heated metal filament depends on the gas pressure since the gas molecules could conduct heat from the filament.
If there is 6 A of current through the filament of a lamp, how many coulombs of charge move through the filament in 1.75 s?
Which of the following is a Nernst equation?
The Nernst equation is given by which of the following statements?
When W=1, we get S=0 which can occur only at T=0K. This is the Nernst-Simon statement of third law of thermodynamics.
What is the value of universal gas constant in Nernst equation when the potential is given in volts?