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3 years ago

A green laser pointer emits light with a wavelength of 542 nm. What is the frequency of this light?

1 answer:

6 0

As we know that wavelength and frequency is inversely proportional to each other. Greater the wavelength smaller the frequency and vice versa.

Solution:

The relation between wavelength and frequency is as follow,

υ = c / λ

where
  υ = frequency = ?
c = velocity of light = 3.0 × 10⁸ ms⁻¹
  λ = wavenumber = 542 nm = 542 × 10⁻⁹ m
Putting the given values,

  υ = 3.0 × 10⁸ ms⁻¹ / 542 × 10⁻⁹ m
Result:
  υ = 5.53 × 10¹⁴ s⁻¹

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Consider the anion whose charge is 2- and whose electron configuration is identical to argon. what is the symbol for this anion

AleksAgata [21]

If the ion is negatively charged, anion, it means that it gains two electrons from its surroundings. The number of electrons of an argon (neutral atom) is 18. Two of the electrons in our anion is from the surrounding, so originally it only has 16 electrons.

In the periodic table, the 16th element is sulphur. The chemical symbol of sulphur is S. Thus, the anion is the negatively charged sulphur with chemical symbol of S2-.

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2 years ago

The area of a telescope lens is 7903 rnrn2 {a) What is the area in square feet (ft2)? (b) If it takes a technician 45 s to polis

LekaFEV [45]

Answer:

Area is 0.08504 $ft^{2}$ and $2.6\times 10^{3}s$ are needed for polishing

Explanation:

(a) ft is unit of F.P.S system whether mm is unit of M.K.S system.

According to unit conversion, $1mm=0.00328ft$

So, $1mm^{2}=(0.00328)^{2}ft^{2}=1.076\times 10^{-5}ft^{2}$

hence, $7903mm^{2}=7903\times 1.076\times 10^{-5}ft^{2}=0.08504ft^{2}$

So, area of telescope lens is 0.08504 $ft^{2}$

(b) $135mm^{2}$ are polished in 45s

So, $7903mm^{2}$ are polished in $\frac{45\times 7903}{135}s$ or $2.6\times 10^{3}s$

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2 years ago

Write out the balanced equation for the reaction that occurs when Li and H2O react together. You do not need to make your subscr

Anarel [89]

Li + H2O →<span> LiOH + H2

The equation is currently unbalanced, so to balance it out, you have to have the same number of each molecule on each side. It'll look like this:

</span>2Li + 2H2O → <span>2LiOH + H2
</span>
Also, in case you want to identify the phases as well, it'll be like this:

2Li (s) + 2H2O (l) → 2LiOH (aq) + H2 (g)

"s" is solid.
"l" is liquid.
"aq" is aquas.
"g" is gas.

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3 years ago

.The pH is 3. What is [H+]? *<br>1 point<br>0.001<br>0.01<br>100<br>1000

Yuki888 [10]

Answer:

0.001 M

Explanation:

The pH scale is used to determine the acidity or basicity of a solution.

If pH < 7, the solution is acid.
If pH = 7, the solution is neutral.
If pH > 7, the solution is basic.

The pH is related to the concentration of hydrogen ions through the following expression.

pH = -log [H⁺]

[H⁺] = antilog -pH = antilog - 3 = 0.001 M

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2 years ago

Describe the population density located along the tectonic plate boundary known as the Ring of Fire and the potential effect tha

pshichka [43]

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The movement of these tectonic plates in the area of the Ring of fire causes the eruption of the lava and disrupts the crust causing an earthquake. This consequence affects the life habiting them.

Learn more about tectonic plates here:

brainly.com/question/11840787

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2 years ago