Answer:
D
Explanation:
d The Ottomans pledged to send troops to support the Germans on the Western Front.
President Johnson proved to be an obstacle to the Radical Republicans in Congress, who attempted to completely overhaul the Southern government and economy.
<u>Answer:</u>
B: Spain was a weaker nation and France a stronger one.
This was the result of the Thirty Years' War.
<u>Explanation:</u>
There were various reasons, religious, territorial and commercial rivalries which led to a thirty-year war, from 1618 to 1648 in European’s history. It started with the Holy Roman emperor imposing Roman Catholic absolutism on his domains and the protest of Bohemians and Austrians to the same.
Various other political reasons kept fueling the war between Poland, Spain, Russia, Moscow. In all these conflicts, Germany suffered the most. So, it couldn’t become a unified state. At the end, peace of Westphalia recognized Europe as an organisation of equal independent states. France emerged as the strongest nation as Spain was hurt badly.
In contrast to mechanical waves, electromagnetic waves can travel without a medium. This implies that electromagnetic waves can pass not only through solid objects like air and rock but also through empty space.
James Clerk Maxwell, a Scottish scientist, created a scientific theory to explain electromagnetic waves in the 1860s and 1870s. He realized that electromagnetic waves can be created when magnetic and electrical fields combine together. He compiled this electricity-magnetism relationship into what are now known as "Maxwell's Equations."
German physicist Heinrich Hertz used Maxwell's theories to explain how radio waves are transmitted and received. In honour of Heinrich Hertz, the hertz, or one cycle per second, is the unit of radio wave frequency. Two issues were resolved by his radio wave experiment. First, he had proven that the speed of radio waves was the same as the speed of light, which was something Maxwell had only theorized.
This demonstrated how radio waves are a type of light. Second, Hertz discovered how to create electromagnetic waves by causing the electric and magnetic fields to separate from wires.
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