Question

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.

Answer 1

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

Answer 2

can u help me...

Answer 3

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

Answer 4

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

Answer 5

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.

Answer 6

ok so 10^-10m * 1000

Answer 7

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

Answer 8

ok this wat i got = 1000000000000

Answer 9

wait.. how did you get that huge number?

Answer 10

i got t bye mulitplyn 10^-9*1000

Answer 11

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

Answer 12

oh ok so the answer is 10^-6

Answer 13

wait...

Answer 14

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

Answer 15

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

Answer 16

so 100nm is that right

Answer 17

Yes 100 nano meters :)

Answer 18

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

Answer 19

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

Answer 20

Just post it then I might take a look :)

Answer 21

I ment as a question :)

Answer 22

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^?

Answer 23

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

Answer 24

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^?

Answer 25

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.

Answer 26

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

Answer 27

im just thinking and trying to figure it out atm

Answer 28

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

Answer 29

@skullpatrol

Answer 30

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

Answer 31

which one

Answer 32

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:

Answer 33

haye can you please help.... @skullpatrol

Answer 34

Any ideas?

Answer 35

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

Answer 36

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

Answer 37

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

Answer 38

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

Answer 39

oh so 80 tmes 1/4 is 20

Answer 40

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

Answer 41

oh ok so 20*1/4=5

Answer 42

Yes.

Answer 43

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

Answer 44

wait can you help me on the next three terms

Answer 45

Just keep multiplying by 1/4...

Answer 46

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

Answer 47

is that right

Answer 48

are yall still there.@skullpatrol @tayluvsya

Answer 49

@skullpatrol

Answer 50

Correct.

Answer 51

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

Answer 52

i really dont get so can you please help me

Answer 53

What was the question?

Answer 54

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^?

Answer 55

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

Answer 56

3

Answer 57

so all of them are three is that alright

Answer 58

Just like multiplying by 1/4 each time.

Answer 59

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

Answer 60

To get the next term multiply by 3

Answer 61

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

Answer 62

Yes.

Answer 63

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.

Answer 64

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

Answer 65

Yes.

Answer 66

ok i have 3 more

Answer 67

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

Answer 68

haye wat happened @skullpatrol