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3 years ago

Pls answer if you know

Chemistry

1 answer:

mylen [45]3 years ago

4 0

Answer:

Song name pls

Explanation:

sojnf nspamwn downgrade

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Which data are shown on topographic maps?

eimsori [14]

Answer:

Topographic maps generally shows Natural features such as Rivers and Lakes.

sometimes they also show some features made by humans like brodges, elevations etc.

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2 years ago

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Citric acid is mostly<br> acid that can kill your body and make water turn into poison or toxic

Alja [10]

Citric acid is not harmful to the body

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3 years ago

How can you tell if a sample contains baking soda and cornstarch or baking powder

densk [106]

You could mix it with some vinegar, if it has cornstarch or baking soda in it will bubble, I'm not sure how to tell with baking powder... I'm not sure if it would have a reaction or not.

Hope this helps.

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3 years ago

What is most likely true about ocean temperatures surrounding Australia, which is marked by the star in the following map?

aivan3 [116]

The answer that is most likely true about ocean temperatures surrounding Australia, which is marked by the star in the following map is that b) the ocean temperatures north of Australia are higher than the ocean temperatures south of Australia.

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4 years ago

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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.

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3 years ago