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3 years ago

Which of the following is NOT true about performing biological investigations?

1 answer:

5 0

The answer to the question stated above is letter C. Most scientists do not use the metric system or SI. This statement is not true about <span>performing biological investigations.
</span>Remember, a<span>ll systems of weights and measures, are linked through a network of international agreements supporting the </span>International System of Units whether it is <span>metric or non-metric. </span>

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What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n =

Lady bird [3.3K]

Answer:

$4.86\times10^{-7}\ \text{m}$

Explanation:

R = Rydberg constant = $1.09677583\times 10^7\ \text{m}^{-1}$

$n_1$ = Principal quantum number of an energy level = 2

$n_2$ = Principal quantum number of an energy level for the atomic electron transition = 4

Wavelength is given by the Rydberg formula

$\lambda^{-1}=R\left(\dfrac{1}{n_1^2}-\dfrac{1}{n_2^2}\right)\\\Rightarrow \lambda^{-1}=1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\\\Rightarrow \lambda=\left(1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\right)^{-1}\\\Rightarrow \lambda=4.86\times10^{-7}\ \text{m}$

The wavelength of the light emitted is $4.86\times10^{-7}\ \text{m}$ .

6 0

3 years ago

You perform an experiment using two bean seeds planted in identical soil. one seed is kept in a window, where it receives a lot

My name is Ann [436]

Answer: A

Explanation: because I am your father

7 0

4 years ago

Which number should be placed before H20 on the products side of the equation to

timama [110]

<h2>The required balanced equation:</h2><h2> $C_3H_8 +5O_2 = 3CO_2 + 4H_2O$ </h2>

Explanation:

• Propane when reacts with oxygen it gives carbon dioxide and water.

In order to make the equation balanced at both ends of the equation,

Add 4 as a coefficient before on L.H.S (Left Hand Side) of Equation.

• Therefore, the required balanced equation is:

Propane, when added with 5 molecules of Water, yields 3 molecules of Carbon Dioxide and 4 molecules of water, as shown in the below equation -

$C_3H_8 +5O_2 = 3CO_2 + 4H_2O$

8 0

3 years ago

What makes an acid or base strong?

AlladinOne [14]

Answer:

Conducts electricity

Explanation:

an acid or base which strongly conducts electricity contains a large number of ions and is called a strong acid or base and an acid or base which conducts electricity only weakly contains a few ions and his called a weaker acid base

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3 years ago

What is not true of a strong base? A. It must have a concentration above 1.0 M. B. It is always a strong electrolyte in water. C

Rashid [163]

The choices are true about the characteristic of a strong base, except for it having a concentration of above 1.0 M. Therefore, the answer is letter A. The concentration of the base is not a very important as to how strong really the base is.

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3 years ago

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