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olganol [36]
3 years ago
11

How small is an atom

Physics
1 answer:
dem82 [27]3 years ago
5 0
An atom must be smaller than any THING you ever saw,
because every THING is made of many atoms.

An atom is too small to see.  Because if you want to see something,
you have to shine a light on it, and the light that bounces off of it
toward your eye is what you see.  But the wavelength of light is
larger than the atom, and the energy in some light waves is enough
to tear the electrons away from the atom.  So it would be like trying to
see a mosquito by bouncing rocks off of it !

Some simple atoms, with very few particles in them, are bigger.  And
some complicated atoms, with hundreds of particles in them, are smaller ! 
That's because more positive protons in the nucleus attract more negative
electrons outside the nucleus with more force.

An atom is so small that it's impossible to say what size it actually IS.
That's NOT because we can't measure it.  It's because of a weird law
of nature, called the "Uncertainty Principle".  It says that the smaller
something is, the less possible it is to KNOW its location.  The best
we can ever say about the electrons that orbit an atom is how LIKELY
they are to be at a certain distance from the nucleus in the center.

Here are the measurements of atoms of a few familiar substances.
The number is the MOST PROBABLE diameter of the sphere.

After I give you the numbers, I'll tell you the UNIT of measurement.

Hydrogen atom     106
Oxygen atom          96
Helium atom           62
Neon atom              76
Lead atom             308
Iron atom               312
Silver atom            330
Gold atom             348
Sodium atom        380

Now ... these numbers don't mean anything until you know the unit.
I mean, you have to know the size of ' 1 ' of them.  So here it is:

The unit of size for that list is 1 "picometer".  (Say  "PEEK-o-MEE-ter")

1 picometer means  1 x 10⁻¹² meter, or  0.000 000 000 001 of a meter.

So the biggest atom on the list ... Sodium, with a diameter of 380 ...
is 380 picometers across.  That's

                                 0.000 000 000 38  of a meter. 

If your pinky fingernail is 1/4 of a centimeter across,
then you could line up this many Sodium atoms across it,
side by side:

                       6,578,947 Sodium atoms.    (about 6 and 1/2 million !)

The answer to your question is:  Awesomely small.

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In reading the instruction manual that came with your garagedoor opener, you see that the transmitter unit in your car produces
iVinArrow [24]

Answer:

0.09221 V/m

Explanation:

\mu_0 = Vacuum permeability = 4\pi \times 10^{-7}\ H/m

P = Power of transmitter = 250 mW

r = Distance to source = 42 m

c = Speed of light = 3\times 10^8\ m/s

E_0 = Electric field amplitude

Intensity of a wave is given by

I=\frac{P}{4\pi r^2}\\\Rightarrow I=\frac{250\times 10^{-3}}{4\pi \times 42^2}\\\Rightarrow I=1.12779\times 10^{-5}\ W/m^2

Intensity is also given by

I=\frac{E_0^2}{2\mu_0 c}\\\Rightarrow E_0=\sqrt{I2\mu_0 c}\\\Rightarrow E_0=\sqrt{1.12779\times 10^{-5}\times 2\times 4\pi \times 10^{-7}\times 3\times 10^8}\\\Rightarrow E_0=0.09221\ V/m

The electric field amplitude at the receiver when it first fails is 0.09221 V/m

3 0
4 years ago
Hannah is very good at picking up differences in other people's mood and behavior. She has been rewarded for her ability to work
Elanso [62]
It's C. Most likely
5 0
4 years ago
Read 2 more answers
Which of the following can easily be studied objectively? history meteorology sociology theology
Vilka [71]
<h2>Answer: meteorology </h2>

Explanation:

From the given options , meteorology is the only one that can be studied objectively, since it is an interdisciplinary science that relies on basic sciences such as physics and mathematics and applied sciences to the study of the atmosphere, the weather, the phenomena produced and the physical laws that govern it. In addition, meteorology uses objective techniques to study and predict the various phenomena that occur in the atmosphere.

Unlike history, sociology and theology, in which there is a possibility of the existence of some data are subjective and not true or only based on opinions <u>without scientific evidence</u>.

8 0
3 years ago
Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other current. If the magnitude of
lions [1.4K]

Answer:

Explanation:

Magnitude of force per unit length of wire on each of wires

= μ₀ x 2 i₁ x i₂ / 4π r    where i₁ and i₂ are current in the two wires , r is distance between the two and  μ₀ is permeability .

Putting the values ,

force per unit length = 10⁻⁷ x 2 x i x 2i / ( 6 x 10⁻³ )

= .67 i² x 10⁻⁴

force on 3 m length

= 3 x .67 x 10⁻⁴ i²

Given ,

8 x 10⁻⁶ = 3 x .67 x 10⁻⁴ i²

i²  = 3.98 x 10⁻²

i = 1.995 x 10⁻¹

= .1995

=  0.2 A approx .

2 i = .4 A Ans .

6 0
4 years ago
Which invention was created to help people with hearing problems? the multiplex telegraph the telephone the phonograph the motio
Nataliya [291]

The phonograph was invented for people with hearing problems. Option D is correct.

<h3>What is a Phonograph?</h3>
  • It is a device that records sounds or music in the grooves of a plate and plays them.
  • This was the first invention that can record and play music.
  • It was invented by Thomas Alva Edison.
  • This device helps people with hearing problems by allowing them to practice concentrating on a different sound.

Therefore, the phonograph was invented for people with hearing problems.

Learn more about Phonograph:

brainly.com/question/858851

7 0
3 years ago
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