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.
Answer:
sight is the most important sense we use, We perceive up to 80% of all impressions by means of our sight. And if other senses such as taste or smell stop working, sight is best to protect us from danger.
Aids in Africa is considered a pandemic .
Answer: Large expenditures by the French monarchy caused dissatisfaction among the people who began to view its leaders wasteful while they suffered due to poor economic state of the nation. This in turn led to national unrest and ultimately the Revolution.
Explanation:
