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umka2103 [35]
3 years ago
11

1. What wavelengths are associated with the light color observed in each metal’s flame test?

Mathematics
1 answer:
Dafna1 [17]3 years ago
7 0

Answer:

Here's what I get

Step-by-step explanation:

1. Wavelengths

\begin{array}{lcc}\textbf{Salt} & \textbf{Flame Colour} & \mathbf{\lambda} \textbf{/nm}\\\text{KCl} & \text{violet} & 423\\\text{LiCl} & \text{red} & 701\\\text{CuCl}_{2} & \text{blue-green} & 492\\\text{NaCl} & \text{ orange-yellow} & 590\\\end{array}

2. Identity of unknown

Don't know. You haven't told us its flame colour.

3. Light filters

You could probably filter lithium light. It is almost pure red.

The other elements emit light of mixed colours. It would be difficult to filter them with filters of a single wavelength.

4. Fireworks chemicals

For a red explosion followed by a green one, the engineer should use LiCl and CuCl₂.

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Angel bought 8 oranges and 11 apples for a total of $15.22.He knows that each orange cost $0.50 and reasoned that each Apple mus
Schach [20]
Oranges = x
apples = y

8x + 11y = 15.22
x = 0.50

8(0.50) + 11y = 15.22
4 + 11y = 15.22
11y = 15.22 - 4
11y = 11.22
y = 11.22/11
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3 0
3 years ago
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The point nearest to the origin on a line is at (4, -4). Find the standard form of the equation of the line.
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Just did a specific one of these; let's do the general case.


The point nearest the origin is (a,b).


The line from the origin through the point is


bx - ay = 0


The line we seek is perpendicular to this one. We swap the coefficients on x and y, negating one, to get the perpendicular family of lines. We set the constant by plugging in the point (a,b):


ax + by = a^2 + b^2


ax + by -( a^2 + b^2) = 0


That's standard form; let's plug in the numbers:


4 x - 4 y - 32 = 0


x - y - 8 = 0



5 0
3 years ago
Hi... I'm a dog <br><br> Factor 64b-16c to identify the equivalent expressions.<br> Choose 2 answers
AleksandrR [38]
8(8b-2c) and 2(32b-8c)
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3 years ago
I need help with this question.
ivann1987 [24]

9514 1404 393

Answer:

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Step-by-step explanation:

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4 0
2 years ago
The parabola opens upward has x = 2 as an axis of symmetry and contains the non -vertex points (1, 9) and (4, 27) write the equa
Sedaia [141]

Answer:

<h3>               f(x) = 6(x - 2)² + 3</h3>

Step-by-step explanation:

f(x) = a(x - h)² + k    - vertex form of the equation of the parabola with vertex (h, k)

"the parabola opens upward" means:  a>0

"the parabola has x = 2 as an axis of symmetry" means:  h = 2

so f(x) = a(x - 2)² + k

"the parabola contains the point (1, 9)" means:

9 = a(1 - 2)² + k

9 = a(-1)² + k

9 = a + k

k = 9 - a

"the parabola contains the point (4, 27)" means:

27 = a(4 - 2)² + k

so:

27 = a(2)² + 9 - a

27 = 4a + 9 - a

3a = 18

a = 6

and  k = 9 - 6 = 3

Therefore the vertex form for this parabola is:

                                     <u> f(x) = 6(x - 2)² + 3</u>

4 0
3 years ago
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