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Soloha48 [4]
3 years ago
12

Which of the following energy sources harnesses the power of waves?

Chemistry
2 answers:
OLEGan [10]3 years ago
5 0
C. wind wmmernbrnrn

Leokris [45]3 years ago
3 0

Answer:

The answer is B!!! Hydrokinetic

Explanation:

Above is incorrect

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Which of Hubble's findings supported the big bang theory? Check all that apply.
grigory [225]

<u>Out of all given options, Hubble's findings supported the big bang theory are as follows: </u>

  • The universe formed from a central point.
  • Most galaxies in the universe are moving away from Earth.
  • There are billions of galaxies in the universe, not just one.

Option C, D, and E

<u>Explanation: </u>

According to big bang theory, the universe is increasing its region of occupancy in free space. As it is known that the universe is composed of several galaxies. So this spreading of the universe is nothing but spreading of galaxies.

And this is confirmed from Hubble’s findings using Hubble’s telescope.  As they have observed that the speed at which the galaxies are travelling in free space has been increased at a faster rate.

So, the galaxies are used to move away from Earth with time at a faster rate which confirms the big bang theory of universe formation. Also, in simple words, universe started from big bang according to cosmology' standard theory, it’s just moves from everything else.

3 0
3 years ago
Read 2 more answers
How many moles of lead, Pb, are in 1.50 x 10^12 atoms of lead?
gulaghasi [49]
<h3>Answer:</h3>

2.49 × 10⁻¹² moles Pb

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Using Dimensional Analysis
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
<h3>Explanation:</h3>

<u>Step 1: Define</u>

1.50 × 10¹² atoms Pb

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

  1. Set up:                                         \displaystyle 1.50 \cdot 10^{12} \ atoms \ Pb(\frac{1 \ mol \ Pb}{6.022 \cdot 10^{23} \ atoms \ Pb})
  2. Multiply:                                                                                                           \displaystyle 2.49087 \cdot 10^{-12} \ moles \ Pb

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

2.49087 × 10⁻¹² moles Pb ≈ 2.49 × 10⁻¹² moles Pb

5 0
3 years ago
When placed near each other, opposite magnetic poles repel each other. Please select the best answer from the choices provided T
Anna11 [10]

<u>Answer:</u> The correct answer is False.

<u>Explanation:</u>

A magnet has two poles defined as a north pole and a south pole.

When two same poles come closer to each other, they tend to repel each other and when two opposite poles come closer to each other, they tend to attract each other.

So, when north pole comes near to another north pole, they will repel each other while when north pole comes near to the south pole, they attract each other.

Hence, the above statement is False.

8 0
3 years ago
Which gas will diffusion faster within a system?
kifflom [539]

Answer:

Methane(CH₄).

Explanation:

  • Thomas Graham found that, at a constant  temperature and pressure the rates of effusion  of various gases are inversely proportional to  the square root of their masses.

<em>∨ ∝ 1/√M.</em>

where, ∨ is the rate of diffusion of the gas.

M is the molar mass of the gas.

<em>∨₁/∨₂ = √(M₂/M₁)</em>

<em></em>

  • The molar mass of different choices:

Carbon dioxide: 44.01 g/mol.

Water vapor : 18.0 g/mol.

Ammonia (NH₃): 17.0 g/mol.

Methane(CH₄): 16.0 g.mol.

<em>Since, methane has the lowest molar mass. So, it will diffuse faster within a system.</em>

3 0
3 years ago
Microwave ovens work by irradiating food with microwaves, which are absorbed by the water molecules in the food and converted to
snow_tiger [21]

Answer:

7.45\times 10^{26} photons are emitted per second in a 1\times 10^3 Watt microwave oven.

Explanation:

The expression for the power is:-

Power=\frac{Energy}{Time}

Also, E=n\times \frac{h\times c}{\lambda}

Where,  

n = the number of photons

h =  Plank's constant having value 6.626\times 10^{-34}\ Js

c =  the speed of light having value 3\times 10^8\ m/s

\lambda = the wavelength of the light

So,  

Power=\frac{n}{Time}\times \frac{h\times c}{\lambda}

Thus, the expression for photons per second is:-

\frac{n}{Time}=\frac{Power\times \lambda}{h\times c}

Given that:-

Power = 10³ Watt

( 1 cm = 0.01 m)

[/tex]

So,  

Photon/sec=\frac{10^{3}\times 0.148}{6.626\times 10^{-34}\times 3\times 10^8}=7.45\times 10^{26}

7.45\times 10^{26} photons are emitted per second in a 1\times 10^3 Watt microwave oven.

7 0
3 years ago
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