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Gekata [30.6K]
4 years ago
8

Most scientists believe that increasing carbon dioxide levels in the atmosphere causes global warming. Explain why using wood as

a fuel is said to be carbon-neutral. Please explain in detail. Need to know as soon as possible.
Chemistry
1 answer:
mash [69]4 years ago
7 0
Wood can be natural source of heat just as coal is however, coal releases chemicals and spoke (which causes smog- nasty poluted fog) wood on the other hand is more natural and does not release any harmful chemicals into the air
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A laser pulse with wavelength 525 nm contains 4.40 mj of energy. How many photons are in the laser pulse
Alexandra [31]

The laser pulse in this question has a wavelength of \lambda=524 nm=525\times 10^{-9}m. To solve this problem, we first have to calculate the energy of a single photon in the laser pulse. The equation for calculating the energy of a single photon of an electromagnetic wave is E=\frac{hc}{\lambda} where c is the speed of light, h is planks constant and \lambda is the wave length of the photons.

For this problem, c=3.0\times 10^8m/s, h=6.63\times10^{-34}J.s and \lambda=525\times 10^{-9}m. We use these values to calculate the energy of the photon as shown below,

E=\frac{hc}{\lambda} \\E=\frac{(6.63\times 10^{32}Js)\times(3.0\times10^8m/s)}{525\times 10^{-9}m} \\E=3.79\times 10 ^{-19}J.

Now that we know the energy for a single photon, we will divide the total energy given by the energy of one photon to get the number of photons in the pulse. The number of photons n is calculated as shown below,

n=\frac{4.4\times 10^{-3}J}{3.79\times10^{-19}J} =1.16\times 10^{16}. There are 1.16\times 10^{16} photons.

5 0
3 years ago
A technical machinist is asked to build a cubical steel tank that will hold "265" L of water. Calculate in meters the smallest p
FrozenT [24]

Answer:

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Explanation:

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I belive this should help :)
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