18. There are 75 Btu. If you need to convert the Btu to Joules, what number would you use to multiple the Btu by?

Physics

1 answer:

Ierofanga [76]3 years ago

5 0

D. 1055

Explanation:

To convert from Btu to joules, we multiply by 1055. Btu denotes British thermal units.

1Btu = 1055Joules.

British thermal unit is a non-standard unit.
It can be defined as the amount of heat required to raise the temperature of 1 pound of water by one degree Fahrenheit.
The standard unit of energy is the Joules.

Learn more:

Joules brainly.com/question/5234679

#learnwithBrainly

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What happens when an electron moving from the 3rd energy level to the 1st energy level?

Sholpan [36]

Answer:

A photon of wavelength 103 nm is released

Explanation:

When an electron in an atom jumps from a higher energy level to a lower energy level, it releases a photon whose energy is equal to the difference in energy between the two levels.

For example, if we are talking about a hydrogen atom, the energy of the levels are:

$E_1 = -13.6 eV\\E_2 = -3.4 eV\\E_3 = -1.5 eV$

So, the energy of the photon released when the electron jumps from the level n=3 to n=1 is

$\Delta E = E_3 - E_1 = -1.5 -(-13.6)=12.1 eV$

In Joules,

$\Delta E =12.1\cdot 1.6\cdot 10^{-19} = 1.94\cdot 10^{-18} J$

We can also find the wavelength of this photon, using the equation:

$\Delta E = \frac{hc}{\lambda}\rightarrow \lambda=\frac{hc}{\Delta E}=\frac{(6.63\cdot 10^{-34})(3\cdot 10^8)}{1.94\cdot 10^{-18}}=1.03\cdot 10^{-7} m = 103 nm$