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2 years ago

Which best describes the effect of J. J. Thomson’s discovery?

1 answer:

8 0

The correct answer for the question that is being presented above is this one: "A. The accepted model of the atom was changed." J J Thomson discovered the electrons and performed experiment using the cathode ray tube
Here are the following choices:
A. The accepted model of the atom was changed.
B. The accepted model of the atom was supported.
C. Cathode ray tubes were no longer used in experiments due to poor results.
D. Cathode ray tubes became the only instrument of use in the study of atoms

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Give a reason why laboratory apparatus are made of ceramics

mixer [17]

Ofc porcelain crucible is a high efficiency material and It can be used as a test piece, retort, but the most common use is as a smelting vessel which is used in furnaces or fire with direct flame.

5 0

2 years ago

A particular energy level in the hydrogen atom has E = -2.42 x 10-19 J. Use Bohr's model of the energy levels in hydrogen to cal

Zepler [3.9K]

Answer:

n=3

Explanation:

The expression for the energy of an electron for the hydrogen atom in the nth orbit is:-

$E_n=-2.18\times 10^{-18}\times \frac{1}{n^2}\ Joules$

Given that:-

$E_n=-2.42\times 10^{-19}\ Joules$

Applying in the equation to find the value of n as:-

$-2.42\times 10^{-19}=-2.18\times 10^{-18}\times \frac{1}{n^2}$

$n^2=\frac{2.18\times 10^{-18}}{2.42\times 10^{-19}}$

$n=\sqrt{\frac{21.8}{2.42}}=3$

7 0

2 years ago

What type of reaction happens inside a nuclear power plant?

brilliants [131]

Hello the answer is C i hope this helps you

7 0

2 years ago

A gas occupies a volume of 60 L at a temperature of 0.5 K. What will the volume be at 4 K?

Flauer [41]

Answer:

480 L

Explanation:

In order to solve this question, you should be familiar with gas laws. (I will attach a picture showing all of them under my answer.) In this question in particular, however, we only need Charles's Law because we're dealing with temperature and volume.

As we can see, Charles's Law is:

$\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }$

or, initial volume over initial temperature equals final volume over final temperature.

In this question, 60 L is our initial volume, and 0.5 K is our initial temperature (K being Kelvin). We are only given 4 K as our final temperature. We are asked to solve for the final volume. Let's set up the equation and solve for $V_{2}$ :

--------------------------------------------------------------------------------------------------------------

(60) / (0.5) = $V_{2}$ / (4)

↓

120 = $V_{2}$ / 4

×4 ×4

↓

$V_{2}$ = 480 L

--------------------------------------------------------------------------------------------------------------

There's our answer! Feel free to comment if you have any questions about my answer :)

3 0

2 years ago

Place the following substances in Order of decreasing boiling point H20 N2 CO

kirill [66]

Answer:

-195.8º < -191.5º < 100º

Explanation:

Water, or H20, starts boiling at 100ºC.

Nitrogen, or N2, starts boiling at -195.8ºC.

Carbon monoxide, or C0, starts boiling at -191.5ºC.

When we place these in order from decreasing boiling point:

-195.8º goes first, then -191.5º, and 100º goes last.

4 0

3 years ago

Read 2 more answers