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Physics, Chemistry and Biology: Post your doubts here!

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does anyone have short, complete revision notes for chemistry, biology or physics ??
 
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Guys does the format of article remain same ? or it varies with the Content ?
If it remains Same then , Is the following Structure Correct ?
1. Title
2. Question to create interest
3. Transition
4. Advantages with supports
5. Disadvantages with supports
6. Conclusion
 
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Can anyone solve this for me? The correct answer is three but idk howw :/
 

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Can anyone solve this for me? The correct answer is three but idk howw :/
Find time for one complete wave to form which is the time period T = 1/f ; T =1/0.5 = 21
Now time for one wave is 2s but there are 1.5 waves on the screen
So time for 1.5 waves to form is 1.5*2 = 3s
 
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