## YumYum247 one year ago 1

1. YumYum247

Let me try my luck first.....

2. YumYum247

319Hz?

3. YumYum247

idk:(

4. Astrophysics

Your beat frequency is just changed

5. Astrophysics

but the steps are initially the same

6. YumYum247

from 2 to 1Hz???????

7. Astrophysics

Yup

8. YumYum247

9. Astrophysics

$1 Hz = |f_2-f_1|$

10. YumYum247

that's what i was using OMG!!!

11. YumYum247

Awwwwnnnn!!! :"(

12. Astrophysics

lol

13. Astrophysics

What did we get for frequency b

14. Astrophysics

322 and 318?

15. YumYum247

both are viable

16. YumYum247

but i guess 322Hz seems legit to me.

17. Astrophysics

I got it, I'll let you think about it for a bit

18. YumYum247

ok but the formula is right tho?????right??

19. Astrophysics

We don't need a formula, all we have to observe is the frequencies dropping 1 Hz

20. Astrophysics

from the original

21. Astrophysics

We figured out the frequencies were 322 and 318

22. YumYum247

ok so in the initial case the freak was 322Hz and beat freak was 2Hz but then it droped to 1Hz

23. Astrophysics

So we have 318 drops to 317 and 322 drops to 321, now if we have beat frequency being 1 Hz, we have the following $320Hz-317Hz = 1 Hz$ or is it $321 Hz - 320 Hz = 1 Hz$ which one can we eliminate

24. YumYum247

second one would be it.

25. Astrophysics

Yes, you're right, so our original frequency then is 322 Hz, notice the question specifies, tuning fork B AND beat frequency dropped 1 Hz. We just had to read it carefully :)

26. YumYum247

ooooooooooh i got it.....

27. YumYum247

so in the first case we got 322 and 318 and the beat freak was 2Hz but then then the beat freak droped to 1 Hz

28. Astrophysics

Yes, as well did the frequency of b

29. Astrophysics

they both dropped by 1, it's a nice question

30. Astrophysics

It checks if you understand the concept or not :P

31. YumYum247

initially we had 320Hz + 2 beat freak = 322 bt then it drooped by 1Hz

32. Astrophysics

Yes, that's what we figured out from the previous question, we had two frequencies for b and we had to decipher which one was the original

33. YumYum247

so 321 - inital 320 = 1Hz

34. Astrophysics

Frequency A was 320Hz, not B

35. Astrophysics

We figured out frequency b in your previous problem to be 322, and 318

36. YumYum247

yah that's what i meant!!!

37. Astrophysics

and it told us in this part that frequency b and the beat frequency both drop by 1 hz

38. Astrophysics

ok do you get it now? :)

39. YumYum247

79.329% but yah i think i got it.

40. Astrophysics

Ok :)

41. YumYum247

Thanks an...just one more :")

42. Astrophysics

>.<

43. Astrophysics

Ok haha

44. YumYum247

I'm sorry love but we have to go through this together.....!! :") LOL

45. YumYum247

i've done the whole question but i'm just stuck at the line part. can you teach me how to do the calculations at the very end...here is a demo.

46. Astrophysics

Other post!

47. Astrophysics

:)

48. YumYum247

|dw:1436341077195:dw|

49. Astrophysics

You need to find the difference

50. Astrophysics

That's just of the drill

51. YumYum247

no i mean how do i punch the numbers into my calclators????

52. Astrophysics

Oooh I see

53. Astrophysics

It requires logarithm rules to make it clear we should put brackets $90 = 10 \log \left( \frac{ I_r }{ I_d } \right)$ we are taking log of base 10, first thing lets get rid of the 10 by dividing by 10 on both sides $9 = \log \left( \frac{ I_r }{ I_d } \right)$ now we can convert it to exponential form $10^9 = \frac{ I_r }{ I_d }$

54. YumYum247

ok i understood that you divided both sides by 10...but how did you get from 9 to 10^9?

55. YumYum247

can you say like "press log and then something....i'll follow you how you did it.

56. Astrophysics

I used the following property $\huge f(f^{-1}(x)) = 10^{\log_{10}x} = x$

57. Astrophysics

We're just taking the inverse

58. YumYum247

inverse of 9

59. Astrophysics

No of the logarithm function

60. Astrophysics

If you have your calculator on you, notice that there's a "Log" button

61. YumYum247

ok

62. Astrophysics

if you put 2nd log that will give you the exponential function

63. YumYum247

yes i;m holding it

64. Astrophysics

That's what we're basically doing, cancelling out the logarithm

65. YumYum247

yes there is

66. Astrophysics

by taking it's inverse which is the exponential function

67. YumYum247

so 2nd log?

68. Astrophysics

Yes, but to make intuitive, think of it like this |dw:1436331095538:dw| sort of like this

69. Astrophysics

We're doing the same thing with logarithm there

70. YumYum247

ok

71. Astrophysics

10^9, that's a huge number a billion actually..

72. YumYum247

so 9 2nd log?

73. Astrophysics

No 2nd log then 9

74. Astrophysics

$\frac{ I_r }{ I_d } = 10^9$

75. YumYum247

no my calculator is different....i'm getting some 1000000000000 as a answer

76. YumYum247

so the rocket launcher is 9 or 100000000000times intense????

77. YumYum247

compared to drilling???????????

78. Astrophysics

a billion times more intense yeah lol

79. Astrophysics

1,000,000,000

80. YumYum247

mother of garden!!! that's insane!!!

81. YumYum247

so each nod on the db scale goes up by 10.

82. YumYum247

for exapmple the differernce between 1db and 2 is 20 times the intensity difference???

83. Astrophysics

|dw:1436331490707:dw| just a comparison of the scale

84. YumYum247

You trully saved my life.........Thank yo infinite.....

85. YumYum247

Thank you 8-> much

86. YumYum247

oo-> mch

87. YumYum247

how did you become so smart???????????????

88. Astrophysics

Lol I am not smart, I consider myself pretty dumb! :)

89. YumYum247

shush........you should be working in some google company

90. Astrophysics

Haha, I wish xD, thank you for the compliment and you're welcome! And a way I gooooo....|dw:1436331812585:dw|

91. YumYum247

hey write something about yourself, so people know who you are and where your from????

92. YumYum247

Man i gotta say this but whoever created this universe is a effin genius!!!

93. Astrophysics

Well, I don't really think all that is important, I just like to help people :)

94. Astrophysics

...also I'm a bit lazy!

95. YumYum247

LOL well you have something in common!!! :"D

96. Astrophysics

hehe

97. YumYum247

no i mean i looked at your gif and it just gave me chills to think who could possibly create something massive as a universe.

98. Astrophysics

How do you know someone created it :p :D :O

99. YumYum247

well nothing really pops up out of nowhere.....

100. Astrophysics

Ok :)

101. YumYum247

the discipline and the order/manner of everything is what really gets me.

102. YumYum247

and that's what Einstein was really fascinated about.....he said nothing really had to be this way.......

103. YumYum247

anyways i think i'm starting to eat your brain now....LOL Thank you shooooooo mch!!!! please stay cute as always and i hope i see you again....:")

104. YumYum247

soo, Goodnoght!!!!

105. Astrophysics