Question

fill in the blank: fill in the blank with the correct words. 1. the first handheld cell phone was invented by martin cooper in 1973. 2. the telephone was invented by alexander graham bell in 1876. 3. percy spencer invented the microwave after he noticed a candy bar melt in his pocket. 4. the main material thomas edison used for the light bulb filament that finally worked was carbon. 5. the first practical electronic television was demonstrated by philo farnsworth.

Explanation:

1. Martin Cooper is credited with inventing the first handheld cell - phone in 1973.
2. Alexander Graham Bell invented the telephone in 1876.
3. Percy Spencer noticed a candy bar melt and went on to invent the microwave.
4. Thomas Edison used carbon for the light - bulb filament that finally worked.
5. Philo Farnsworth demonstrated the first practical electronic television.

Answer:

1. Martin Cooper
2. telephone
3. microwave
4. carbon
5. Philo