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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Virginia. They left after 1863 along with Delaware, Maryland, Kentucky, and Missouri.
The impact of <em>Paula Lehner's use of the word </em><em>"tools"</em><em> in paragraph 3 of "Fight Fire with Fire"</em> is <em>C. It emphasizes that </em><em>prescribed burns </em><em>should be used only under specific conditions.</em>
Prescribed or controlled burns are used when the conditions are right <em>to create forest access, reduce insects, and increase the health of plants and the environment.</em> On the other hand, prescribed burns can damage the environment and pollute the air, but wildfires create far worse situations.
The word "tools" does not mean that
- <em>A. It minimizes the emotional reaction people often have to prescribed burns. </em>
- <em>B. It indicates that using prescribed burns in firefighting is similar to other trades </em>
- <em> D. It suggests that prescribed burns have costs similar to other implements used by firefighters.</em>
Thus, according to Paula Lehner, prescribed burns should be used as tools to prevent wildfires.
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Answer:
C. place where the middle class could offer help to the poor.
Explanation:
Settlement houses were organizations that provided support services to the urban poor and European immigrants, often including education, healthcare, childcare, and employment resources.they provided a safe place for poor residents to receive medical care and provided nurseries for the children of working mothers.
