Frequency - number of waves (vibrations, revolutions, of cycles) that pass a given point per unit time.
the correct answer should be A
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Answer:
300000 KM/Sec
Explanation:
Distance between the Earth and Planet Y = 20 LY
One light year is the distance traveled when traveling at the speed of light which 300000 KM/Sec.
Anna passed the Earth traveling at speed v. After reaching planet Y, she is 20 years older than when she passed Earth. That means she took 20 years to reach planet Y. This is only possible when she traveled with the speed of light
So the velocity v = 300000 KM/Sec.
Answer:
C. Adding some of the unknown liquid to red litmus paper.
Explanation:
Since the student doesn't know what the liquid is, it is not safe to experiment with it by boiling, cooling, or adding water to it. The safest option would be to add a small bit of the liquid to the litmus paper, which will identify the liquid as neutral, basic, or acidic.
Answer:
When we talk about residential uses of energy, these are the most basic uses of energy . They include watching television, washing clothes, heating and lighting at home , taking a shower, working from home on your laptop or computer, running appliances and cooking.
