A) Chemical combustion B) Gas discharge C) Joule heating D) Nuclear fusion
A) To prevent oxidation B) To increase brightness C) To generate electricity D) To cool the filament
A) More than 50% B) Around 15% C) Less than 5% D) About 25%
A) James Bowman Lindsay B) Joseph Swan C) Humphry Davy D) Thomas Edison
A) It frequently caused electrical fires B) It required toxic gases C) It was not bright or long-lasting D) It was too expensive to produce
A) 1840 B) 1860 C) 1880 D) 1802
A) Using neon gas for illumination B) Using phosphorus vapors as a getter C) Using tungsten filaments D) Creating a better glass seal
A) Tungsten metal B) Cotton thread C) Carbonized Japanese bamboo D) Platinum wire
A) Royal Institution B) Savoy Theatre C) Château de Blois D) Mosley Street Opera House
A) They were too fragile B) They required too little electricity C) They required specialized glass D) They were too bright and emitted carbon monoxide
A) Frederick de Moleyns B) Alexander Lodygin C) Joseph Swan D) Thomas Edison
A) Columbia B) Titanic C) Jumbo D) Savoy
A) Platinum wire B) Tungsten strip C) Carbon rod D) A ceramic globar
A) With improved vacuum pump processing B) By adding nitrogen gas C) By using a platinum filament D) By using a thicker glass bulb
A) 100 lm/W B) 16 lm/W C) 60 lm/W D) 13 lm/W |