Hi!
The answer is 3. All these answers are correct.
Practical radio communication was furthered by enthusiasts who were experimenting with Hertz and Maxwell's findings.
By the theory of modulation because it helped establish the earliest method to transmit voice by radio.
By the use of vacuum tubes because they made detection and amplification of radio signals possible.
So, all of these 3 factors furthered the development of practical radio communication.
Answer: Positive and negative effects of Industrial Revolution
Explanation:
The Industrial Revolution saw an increase in the efficiency of technology and thus allowed for goods to be produced faster and in larger quantities which led to goods being cheaper. Transportation and communication also became faster as modes of transport like Railroads gained momentum and there was a rise in the standard of living.
However, there were dangerous working conditions in factories where people would toil for long hours with low pay. So many people moved from the rural areas to the urban areas in search of jobs which led to overcrowded urban areas.
This excerpt therefore shows the advantages and disadvantages of the Industrial Revolution.
Answer: Vital supplies and fuel were not destroyed by the Japanese attack--only ships and airplanes.
Explanation: