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.

- anonymous

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- anonymous

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

- anonymous

can u help me...

- Frostbite

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

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## More answers

- Frostbite

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

- Frostbite

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.

- anonymous

ok so 10^-10m * 1000

- Frostbite

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

- anonymous

ok this wat i got = 1000000000000

- Frostbite

wait.. how did you get that huge number?

- anonymous

i got t bye mulitplyn 10^-9*1000

- Frostbite

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

- anonymous

oh ok so the answer is 10^-6

- Frostbite

wait...

- Frostbite

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

- Frostbite

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

- anonymous

so 100nm is that right

- Frostbite

Yes 100 nano meters :)

- Frostbite

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

- anonymous

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

- Frostbite

Just post it then I might take a look :)

- Frostbite

I ment as a question :)

- anonymous

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^?

- Frostbite

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

- anonymous

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^?

- Frostbite

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.

- anonymous

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

- anonymous

im just thinking and trying to figure it out atm

- anonymous

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

- anonymous

@skullpatrol

- anonymous

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

- anonymous

which one

- anonymous

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:

- anonymous

haye can you please help.... @skullpatrol

- skullpatrol

Any ideas?

- anonymous

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

- skullpatrol

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

- anonymous

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

- skullpatrol

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

- anonymous

oh so 80 tmes 1/4 is 20

- skullpatrol

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

- anonymous

oh ok so 20*1/4=5

- skullpatrol

Yes.

- anonymous

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

- anonymous

wait can you help me on the next three terms

- skullpatrol

Just keep multiplying by 1/4...

- anonymous

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

- anonymous

is that right

- anonymous

are yall still there.@skullpatrol @tayluvsya

- anonymous

@skullpatrol

- skullpatrol

Correct.

- anonymous

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

- anonymous

i really dont get so can you please help me

- skullpatrol

What was the question?

- anonymous

- skullpatrol

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

- anonymous

3

- anonymous

so all of them are three is that alright

- skullpatrol

Just like multiplying by 1/4 each time.

- anonymous

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

- skullpatrol

To get the next term multiply by 3

- anonymous

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

- skullpatrol

Yes.

- skullpatrol

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.

- anonymous

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

- skullpatrol

Yes.

- anonymous

ok i have 3 more

- anonymous

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

- anonymous

haye wat happened @skullpatrol

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