## darkb0nebeauty Group Title Ultraviolent rays, which cause sun burn by penetrating only the top level of kin, have a wavelength about 1000 times the wavelength of an X-ray. Find the wavelength of ultraviolent rays. Show your work. one year ago one year ago

1. darkb0nebeauty Group Title

Medical X-rays, with a wavelength of about 10 ^-10m, can penetrate completely through you skin.

2. darkb0nebeauty Group Title

can u help me...

3. Frostbite Group Title

Why don't you just multiply the wavelength of an X-ray with 1000 in order to get the wavewength of a UV ray?

4. Frostbite Group Title

Not sure, but sounds like that it is only that.

5. Frostbite Group Title

beside we know that X-rays have a wavelength on about 100 nano meter.. if we take 10^-10 meter and convert to nano meters.. we get 0.1 nm. Multiply that with 1000 and you get 100 nm.

6. darkb0nebeauty Group Title

ok so 10^-10m * 1000

7. Frostbite Group Title

if I had to guess, yes. Because we know the multiplication factor and one of the wavelengths. However if I were you I would calculate in nano meters. nano = 10^-9

8. darkb0nebeauty Group Title

ok this wat i got = 1000000000000

9. Frostbite Group Title

wait.. how did you get that huge number?

10. darkb0nebeauty Group Title

i got t bye mulitplyn 10^-9*1000

11. Frostbite Group Title

I doubt that. Lets do it in the head: $10^{-9}*1000=10^{-9}*10^{3}=10^{-9+3}=10^{-6}$

12. darkb0nebeauty Group Title

oh ok so the answer is 10^-6

13. Frostbite Group Title

wait...

14. Frostbite Group Title

it was not 10^-9 but 10^-10

15. Frostbite Group Title

$10^{-10} m*1000=10^{-10} m *10^{3}=10^{-10+3} m=10^{-7} m$ $10^{-7} m * 10^{9} \frac{ nm }{ m }=100 nm$

16. darkb0nebeauty Group Title

so 100nm is that right

17. Frostbite Group Title

Yes 100 nano meters :)

18. Frostbite Group Title

I think. not 100% sure if the procedure is right... seems to esay for some reason.

19. darkb0nebeauty Group Title

ok so 100nm, can you help me with another one

20. Frostbite Group Title

Just post it then I might take a look :)

21. Frostbite Group Title

I ment as a question :)

22. darkb0nebeauty Group Title

Consider the sequence 2, 6, 18, 54…. Let n= the term number in the sequence. Let A (n) = the value of the nth term of the sequence. 4. What is the common ratio of the sequence? Common ratio: 5. Complete each statement. a. A (1) =2=2*3^? b. A (2) =6=2*3=2*3^? c. A (3) =18=2*3*3=2*3^? d. A (4) =54=2*3*3*3=2*3^? 6. What is the relationship between the exponent of the base 3 and the value of n? 7. Complete the statement: A (n) = 2*3^?

23. Frostbite Group Title

Hmmm I think you need to post this as a seperate question, not sure I fully understand the question.

24. darkb0nebeauty Group Title

Activity 2 Consider the sequence 2, 6, 18, 54…. Let n= the term number in the sequence. Let A (n) = the value of the nth term of the sequence. 4. What is the common ratio of the sequence? Common ratio: 5. Complete each statement. a. A (1) =2=2*3^? b. A (2) =6=2*3=2*3^? c. A (3) =18=2*3*3=2*3^? d. A (4) =54=2*3*3*3=2*3^?

25. Frostbite Group Title

I just ment i don't understand the way they put it... I'm not from the US so I have to translate the words back and forth, and when I do so I get something that don't make sence. All I can say is that you can discribe your function/seq as this: A(n)=2*3^n, n belongs to all whole positive numbers.

26. darkb0nebeauty Group Title

ok, is that is that all you get. @Frostbite wat bout you @aspenfields

27. aspenfields Group Title

im just thinking and trying to figure it out atm

28. darkb0nebeauty Group Title

haye ca you put that work back to the first one please...@Frostbite

29. tayluvsya Group Title

@skullpatrol

30. darkb0nebeauty Group Title

ok while we are waitin for that one can u help me with this other one...please!!!

31. tayluvsya Group Title

which one

32. darkb0nebeauty Group Title

A. What is the common ratio of the sequence 80, 20, 5, 5/4…? Common ratio: B. What are the next three terms in the sequence? Next three terms:

33. darkb0nebeauty Group Title

34. skullpatrol Group Title

Any ideas?

35. darkb0nebeauty Group Title

ok are you going tew help me on the first one or the next three term, but with the first one o idea and the second one i do i have 1 idea

36. skullpatrol Group Title

What number do you need to multiply by 80 to get 20?

37. darkb0nebeauty Group Title

you cant muliply anything by 80 to get 20 but 20*4 is 80

38. skullpatrol Group Title

How about $$\frac{1}{4}$$

39. darkb0nebeauty Group Title

oh so 80 tmes 1/4 is 20

40. skullpatrol Group Title

$$80*\frac{1}{4}=20$$

41. darkb0nebeauty Group Title

oh ok so 20*1/4=5

42. skullpatrol Group Title

Yes.

43. darkb0nebeauty Group Title

thanks so much ok so can you help me on the other one now.... the first one or do you want me to post it up there

44. darkb0nebeauty Group Title

wait can you help me on the next three terms

45. skullpatrol Group Title

Just keep multiplying by 1/4...

46. darkb0nebeauty Group Title

ok is the next term 5/16, then 5/64, then 5/256

47. darkb0nebeauty Group Title

is that right

48. darkb0nebeauty Group Title

are yall still there.@skullpatrol @tayluvsya

49. darkb0nebeauty Group Title

@skullpatrol

50. skullpatrol Group Title

Correct.

51. darkb0nebeauty Group Title

so i did it right. ok so can you help me on the first one

52. darkb0nebeauty Group Title

53. skullpatrol Group Title

What was the question?

54. darkb0nebeauty Group Title

Activity 2 Consider the sequence 2, 6, 18, 54…. Let n= the term number in the sequence. Let A (n) = the value of the nth term of the sequence. 4. What is the common ratio of the sequence? Common ratio: 5. Complete each statement. a. A (1) =2=2*3^? b. A (2) =6=2*3=2*3^? c. A (3) =18=2*3*3=2*3^? d. A (4) =54=2*3*3*3=2*3^?

55. skullpatrol Group Title

What do you have to multiply 2 by to get 6?

56. darkb0nebeauty Group Title

3

57. darkb0nebeauty Group Title

so all of them are three is that alright

58. skullpatrol Group Title

Just like multiplying by 1/4 each time.

59. darkb0nebeauty Group Title

ok that i dont get can you please help me i have to turn this in before 12:30

60. skullpatrol Group Title

To get the next term multiply by 3

61. darkb0nebeauty Group Title

so a. 6 b.18 c.54 d. 162 is that right

62. skullpatrol Group Title

Yes.

63. skullpatrol Group Title

The whole idea behind these type of questions is to answer: "what do I need to multiply by to get the next term"? and then continue using that number.

64. darkb0nebeauty Group Title

so what i got up there are those the right answers....

65. skullpatrol Group Title

Yes.

66. darkb0nebeauty Group Title

ok i have 3 more

67. darkb0nebeauty Group Title

actually it comes along with it, look back up with the one we just worked out and it says the common ratio, is the ratio times 1/4 or what

68. darkb0nebeauty Group Title

haye wat happened @skullpatrol