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marta [7]
3 years ago
14

If you had to explain to a non-scientist why it is that scientists accept the idea that all material things are composed of atom

s what evidence would you use?
Physics
1 answer:
Taya2010 [7]3 years ago
5 0

Answer:

There are many things that convinced scientists of the existence of atoms,  and it has been accepted for at least 100 years now, examples are the macroscopic behaviour of gases, the light emitted by hydrogen lamps, and more recently it has become possible to see individual atoms with the best microscopes!

Explanation:

There are many reasons why people thought that our material world was composed of atoms. One of the most striking reasons why scientists came to believe in atomic theory was how it could explain phenomena like the behaviour of gases, by assuming that gases were composed of a great number of individual particles moving randomly, scientists like Maxwell and Boltzmann developed a theory that could explain the macroscopic behaviour of gases, this theory is called the Kinetic Theory of Gases.

More convincing maybe is how Quantum mechanics can predict phenomena like the atomic emission spectrum of Hydrogen and many molecules and atoms. That the spectra of different elements can be explained by assuming they are made of atoms and using quantum mechanics to predict the frequency at which these atoms will emit or absorb light is a very convincing argument! The Spectrum of hydrogen can be seen with an hydrogen lamp and a prism to separate the different wavelengths.

Moreover, modern electron microscopes can indeed detect single atoms! That means that one can quite literally see single atoms.

Most of the technological development of humanity for the last century wouldn't have been possible without atomic theory, as it underpin our understanding of the physical world.

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Reaction rates are affected by reactant concentrations and temperature. this is accounted for by the ________.
Black_prince [1.1K]
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Reaction rates are affected by reactant concentrations and temperature. this is accounted for by the c</span>ollision model.

-Hope this helps.
7 0
3 years ago
) In the figure below, three charges K, L and M are placed at the corners of an equilateral triangle. If K and L are fixed, in w
abruzzese [7]

Answer:

B)

Explanation:

Negative (-) charge M will not move towards negative (-) charge K because, same charges will not attract each other in the given case

Negative (-) charge at the M tends to move towards positive (+) charge L in the direction of B) because opposite charges attract each other.

4 0
3 years ago
In 2020, nasa confirmed the existence of what on the lunar surface?.
kipiarov [429]
Water was confirmed to be on the sunlit surface of the Moon
6 0
2 years ago
Consider the motion of a 4.00-kg particle that moves with potential energy given by U(x) = + a) Suppose the particle is moving w
gtnhenbr [62]

Correct question:

Consider the motion of a 4.00-kg particle that moves with potential energy given by

U(x) = \frac{(2.0 Jm)}{x}+ \frac{(4.0 Jm^2)}{x^2}

a) Suppose the particle is moving with a speed of 3.00 m/s when it is located at x = 1.00 m. What is the speed of the object when it is located at x = 5.00 m?

b) What is the magnitude of the force on the 4.00-kg particle when it is located at x = 5.00 m?

Answer:

a) 3.33 m/s

b) 0.016 N

Explanation:

a) given:

V = 3.00 m/s

x1 = 1.00 m

x = 5.00

u(x) = \frac{-2}{x} + \frac{4}{x^2}

At x = 1.00 m

u(1) = \frac{-2}{1} + \frac{4}{1^2}

= 4J

Kinetic energy = (1/2)mv²

= \frac{1}{2} * 4(3)^2

= 18J

Total energy will be =

4J + 18J = 22J

At x = 5

u(5) = \frac{-2}{5} + \frac{4}{5^2}

= \frac{4-10}{25} = \frac{-6}{25} J

= -0.24J

Kinetic energy =

\frac{1}{2} * 4Vf^2

= 2Vf²

Total energy =

2Vf² - 0.024

Using conservation of energy,

Initial total energy = final total energy

22 = 2Vf² - 0.24

Vf² = (22+0.24) / 2

Vf = \sqrt{frac{22.4}{2}

= 3.33 m/s

b) magnitude of force when x = 5.0m

u(x) = \frac{-2}{x} + \frac{4}{x^2}

\frac{-du(x)}{dx} = \frac{-d}{dx} [\frac{-2}{x}+ \frac{4}{x^2}

= \frac{2}{x^2} - \frac{8}{x^3}

At x = 5.0 m

\frac{2}{5^2} - \frac{8}{5^3}

F = \frac{2}{25} - \frac{8}{125}

= 0.016N

8 0
3 years ago
A series circuit has two 10-ohm bulb is added in a series. Technician A says that the three bulbs will be dimmer than when only
ANTONII [103]

Answer:

Technician  A  is right. The situation will happens even with only two bulbs in series

Explanation:

We must take into account that

1.- All electric device need its nominal voltage to operate

2.-Any and all electric device means an electric load for the source in terms of equation that means any device will implies a drop voltage of V = I*R ( I the flows current and R  the resistance of the device)

3.-Nominal voltage for bulbs are specify for houses voltages you find between fase and neutral wires for instance in Venezuela 120 (v).

4.-In a imaginary circuit of only one bulb, the nominal voltage will be applied and the bulb will operates correctly, but when you add another bulb (in series) the nominal voltage will split  between the two bulbs ( we  could find a situation such as the first bulb work properly but the second one does not). The voltage split according to Ohms law (in such way that the sum of voltage between the terminal of the first bulb plus the voltage at terminals of the second one are equal to nominal voltage.

For that reason all the bulbs are connected in parallel in wich case all of them will operate with the common voltage

4 0
3 years ago
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