A Multiple Choice
identify the letter of the choice that best completes the statement or answers the question
1. Electromagnetic waves are
a transverse waves
b. longitudinal waves.
2. Electromagnetic waves
a need a medium to travel through
b. can travel through a vacuum.
3. Which of these electromagnetic waves has the shortest wavelength?
a. Infrared waves
b. Light waves
c. Radio waves
d. X-rays
e. Ultraviolet waves
4. Compared to the wavelength of ultraviolet waves, the wavelength of infrared waves is
a. the same
b. shorter.
c. longer.
5. Compared to the velocity of radio waves, the velocity of visible light waves is
a. slower.
b. faster.
c the same
6. The source of ali electromagnetic waves is
a. magnetic fields.
b. sun

1. A

2. B

3. D

4. C.

5. C

6. B

Explanation:

https://quizlet.com/289281076/physics-chapter-27-flash-cards/

when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.  

the main objectives of the progressive movement were eliminating problems caused by industrialization, urbanization, immigration, and political corruption.