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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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In the laboratory, a general chemistry student measured the pH of a 0.529 M aqueous solution of phenol (a weak acid), C6H5OH to

Artyom0805 [142]

Answer:

The dissociation constant of phenol from given information is $9.34\times 10^{-11}$ .

Explanation:

The measured pH of the solution = 5.153

$C_6H_5OH\rightarrow C_6H_5O^-+H^+$

Initially c

At eq'm c-x x x

The expression of dissociation constant is given as:

$K_a=\frac{[C_6H_5O^-][H^+]}{[C_6H_5OOH]}$

Concentration of phenoxide ions and hydrogen ions are equal to x.

$pH=-\log[x]$

$5.153=-\log[x]$

$x=7.03\times 10^{-6} M$

$K_a=\frac{x\times x}{(c-x)}=\frac{x^2}{(c-x)}=\frac{(7.03\times 10^{-6} M)^2}{ 0.529 M-7.03\times 10^{-6} M}$

$K_a=9.34\times 10^{-11}$

The dissociation constant of phenol from given information is $9.34\times 10^{-11}$ .

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3 years ago

What is an electrolyte?

Mashcka [7]

Answer:

A substance that can conduct electricity in solution

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3 years ago

What is required to cause acceleration or cause an object to move

OverLord2011 [107]

A "FORCE" is required to cause acceleration or cause an object to move.

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3 years ago

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4. Identify items in your life that are made of each type of element: metal, nonmetal, and metalloid. For each item, explain why

Neko [114]

Bed frame is metal so it is able to be sturdy and hold up
cleaning agents are mettaliods some contain boron to control strength of bleach , and removing stains
plotting soil is non metal it is rich with nitrogen which is good for plants

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3 years ago

you wish to make a 0.161 m hydroiodic acid solution from a stock solution of 3.00 m hydroiodic acid. how much concentrated acid

mestny [16]

5.367 ml of the concentrated acid must be added to obtain a total volume of 100 ml of the dilute solution.

Dilution is defined as the process in which the concentration of a sample is decreased by adding more solvent. The dilution formula is given below.

C₁V₁ = C₂V₂

where C₁ = initial concentration of sample = 3.00 m

V₁ = initial volume of sample

C₂ = final concentration after dilution = 0.161 m

V₂ = total final volume after dilution = 100 ml

Plug in the values to the formula and solve for the volume of the concentrated acid that must be added.

C₁V₁ = C₂V₂

3.00 m (V₁) = 0.161 m (100 ml)

V₁ = 5.367 ml

Learn more about dilution here: brainly.com/question/1615979

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1 year ago