Answer:
Statement that is true about electromagnetic and mechanical waves is:
Option B: Mechanical waves must travel through a medium, but electromagnetic waves do not require a medium to travel.
Explanation:
'Electromagnetic' waves do not need any medium to travel whereas 'mechanical waves' need a medium or matter for transmission. Electromagnetic waves are produced by the 'vibrations' of the charged particles. They can even travel in vacuum.
On the contrary, mechanical waves are caused by the 'wave amplitude'. Mechanical wave can travel in solid, liquid and gas and are considered to be periodic disturbance.
Thus, Option B is the most statement apt explaining the difference between electromagnetic and mechanical waves.
The Enlightment writers fought for the rights of citizens and against the social and economical mechanisms of the Ancient Regime and the feudalism.
On the first hand, they established the fight for Reason and for the scientific methods as the ways to build knowledge hence, breaking with dogmatic beliefs, superstitions or extreme religious ideas.
It is important to highlight as well the ideas developed by Rousseau in his work <em>The social contract</em>, were he appointed that the citizens should be the ones legitimized to grant the power to the rulers of a state through suffrage. Therefore he supported popular sovereignty and suffrage. This sharply contradicted the absolute monarchy system that was the status quo in most European countries when the Enlightment ideas emerged .
Also, the idea of the division of powers was developed by Montesquieu. He stated that 3 branches of powers should be created in the goverment of each states: legislative, executive and judiciary, together with a system that prevents any of them from gathering too much power and ending up overruling the others.
Finally, the Enlighment claimed for basic human and civil rights: suffrage, freedom of speech, freedom of association, private property, etc. The first right declaration were written based on these ideas.
Compared to the parties of the US government, the Chinese communist party is strictly authoritarian wherein there is only a single party for the different branches of government. The Chinese Communist Party faces a host of pressing domestic and international policy<span> issues as it transitions to a new generation of leaders.</span>
Answer:
The first regularly scheduled airmail route connected New York and Washington, D.C., via
Philadelphia, from May 15, 1918, to May 31, 1921. The Post Office Department operated the
218-mile route to demonstrate that mail transportation by airplane was possible on a regular
schedule in all kinds of weather.
