## YumYum247 one year ago yelp!!!!!!!!!

1. YumYum247

@dan815 could you plz give me a quick tuition on this topic, i'm really struggling here :(

2. YumYum247

3. YumYum247

ok i need to learn from the ABC for the concept!!!

4. YumYum247

ok so i know that when two waves interfere with each other they produce either, constructive waves if the waves are over the equilibrim or destructive waves if under the equilibrium.

5. nincompoop

partial too

6. YumYum247

the only thing i'm struggling to understand is that fact that how do i know what shape the two waves will produce when collide with each other....like how do i do my calculations??

7. nincompoop

depending how the waves interacted and waves can vary in energy too

8. YumYum247

there is no concept of energy here, just the types of collisions and what shape it'll produce and in what direction!!!

9. nincompoop

but not all waves are the same nor collide in two manners only

10. YumYum247

but what is for sure is that fact that there are only two options given to me so therefore all the questions are related to either constructive or destructive waves.....btw how do i calculate the resultant displacement of the two waves...

11. YumYum247

could you please do a quick drawing of at least one of the examples?!?!!??!

12. YumYum247

any idea????????????????

13. YumYum247

14. anonymous

I know this is generally more complex, but do they maybe just want you to add/subtract here?

15. anonymous

http://www.physicsclassroom.com/class/waves/Lesson-3/Interference-of-Waves superposition drawing near bottom

16. YumYum247

yes but since these are "shapes", i'm struggling to understand how do i calculate the resultant displacement. i know the first one is construction and the second one is neither construction or destruction, i'll be a wave since crest and trough cancel out each other.

17. dan815

do you still need help?

18. YumYum247

19. dan815

is it that same picture up at the top

20. YumYum247

yes the picture at the top is the qestion, how do i calculate the resultant displacement in figure 1.

21. YumYum247

i know when two waves interact with each other, the form a superposition where the crest of both waves are combined but how do i put that into a mathematical form?!?!?!?!

22. dan815

okay now linear Superposition principle can be summarized byt this equation f(x+y)=f(x)+f(y) we say such an equation follows the principle of Lin sup pos

23. YumYum247

can you please just do one question in drawing?!?!?!!? i'll do the rest.

24. dan815

um okay so its not exactly the crests that are combines its all the heights everywhere

25. YumYum247

26. dan815

|dw:1436150952876:dw|

27. YumYum247

in this case it'll be zero since A = highest - lowest /2

28. dan815

|dw:1436151013791:dw|

29. YumYum247

how tho?????? :O

30. dan815

okay what we do is look at every x values and add the 2 heights there

31. YumYum247

ok so do we come up with our own numbers here to calculate eveything

32. dan815

|dw:1436151217242:dw|

33. YumYum247

i thought crest would cancel out trough and the remaining (rectangle) would continue to move in the right direction.

34. dan815

brb

35. dan815

ok back

36. YumYum247

Awwwnnnn!!!! |dw:1436162165903:dw|

37. dan815

how come yours is different from the picture

38. YumYum247

ok assume that the rectangle is touching the sin wave...sorry my bad.

39. dan815

|dw:1436151592824:dw|

40. dan815

we add 1 to everywhere on that wave

41. YumYum247

ok so to do my calculations, do i just make up my own numbers, i mean height

42. dan815

ill draw on the pic

43. YumYum247

ok please slow down for a sec.

44. dan815
45. YumYum247

please answer my questions before you proceed with the qestion.....i want to clearfy everything first.

46. dan815

ok what

47. YumYum247

so to do all the calclations, do i make up my own numbers, i mean when i draw those diagrams on the graph, to calculate the dispalcement???

48. dan815

well they gave u only pictures so answer with a picture

49. YumYum247

and please tell me the main rule/ recipe

50. YumYum247

but the picture is not on scale.

51. dan815

so

52. YumYum247

ok so that means we don't need to draw it on the graph paper????

53. dan815

i dont know

54. YumYum247

can you solce without the need of graph paper????

55. YumYum247

solve

56. dan815

okay main thing is the form is this f(x)= k + k*sin(x)

57. YumYum247

ok

58. dan815

you are adding to like a sin(x) looking wave

59. dan815

its not really a sine wave, just making that up

60. YumYum247

ok so how do we utilize the equation to find the displaceent

61. YumYum247

@dan815 ok so i add 1 and then what?

62. dan815

hi

63. YumYum247

hi :)

64. dan815

lol

65. dan815

lets start over

66. YumYum247

67. YumYum247

:)

68. dan815

|dw:1436152421672:dw|

69. YumYum247

ok.

70. dan815

|dw:1436152449162:dw|

71. YumYum247

ok i see.

72. dan815

|dw:1436152521293:dw|

73. YumYum247

but how do you know how high is that???? since there are no numbers given

74. dan815

we dont

75. YumYum247

ok cool....next!!!

76. YumYum247

ok so you brought everything on the positive side of the equilibrium....nice!!

77. YumYum247

78. dan815

there are no numbers

79. YumYum247

ok i see.

80. YumYum247

ok what's next.

81. dan815

u tell me

82. YumYum247

honestly if i knew i'dn't be here. but give me some time to take a guess!!!

83. YumYum247

you add crest of both waves!!!

84. dan815

the question is done

85. YumYum247

but the question asks me to "determine the resultant wave" so what do i say?!?!?!?

86. dan815

|dw:1436152891797:dw|

87. YumYum247

btw how would the final wave look like if we're to actually draw the resultant wave!!

88. YumYum247

what happened to the green magenta rectangle, weren't you suppose to add that height as well.

89. YumYum247

because the rule says, when two waves collide, they make constructive wave!!!

90. dan815

|dw:1436153051159:dw|

91. YumYum247

OMG i kinda understood what you did there.....!!!

92. YumYum247

ok i got it......!!!

93. YumYum247

ok so what would happen to the first one?!???!

94. YumYum247

since both are on the positive side of the equilibrium......do you just stack the inner box on the outer box?!?!?!?! yes i think SO

95. YumYum247

@dan815 please check if i did that right?!?!?!?

96. dan815

ill give u a problem do it to the best of your ability

97. YumYum247

so for the first question do you just stack the inner black box on top of the dotted box?!?!?!

98. dan815

|dw:1436153397371:dw|

99. dan815

what is the result of these 2?

100. YumYum247

wait is that a V or a triangle?!?!?!?

101. dan815

okay try another one

102. dan815

|dw:1436153559275:dw|

103. dan815

|dw:1436153620648:dw|

104. dan815

|dw:1436153640721:dw|

105. YumYum247

hold on damn it... let me think :"D LOL

106. YumYum247

ok so for this, you add 1 to the "U" thing to create a constructive wave, so i'll be on top of that weird figure.|dw:1436164542171:dw|

107. YumYum247

108. YumYum247

109. YumYum247

110. YumYum247

@dan815 All done!!!! :"D

111. YumYum247

can't believe i spent an entire day on this silly concept!!! Thanks you and Love you to death for helping me out. GOD BLESS YOU.