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3 years ago

_ is used as construction materials.

Chemistry

2 answers:

musickatia [10]3 years ago

6 0

Answer:

Q1) Bedrock

Q2) Topsoil

Q3) Desertification

Explanation:

YO NOW YOU HAVE TO ASNWER MY QUESTION AND SHOW UR WORK BROOOOOOOOOOOOOOOOOOOOOOOO DO IT ASAP

Nimfa-mama [501]3 years ago

5 0

Answer:

1) Bedrock

2) Topsoil

3) Desertification

Explanation:

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Serhud [2]

Explanation:

Given that,

The frequency of electromagnetic spectrum is $2.73\times 10^{16}\ Hz$

(A) Let the wavelength of this radiation is $\lambda$ . We know that,

$c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{2.73\times 10^{16}}\\\\\lambda=1.09\times 10^{-8}\ m$

So, the wavelength of this radiation is $1.09\times 10^{-8}\ m$ .

(B) Let E is the energy associated with this radiation. Energy of an electromagnetic radiation is given by :

$E=hf$

h is Planck's constant

$E=6.63\times 10^{-34}\times 2.73\times 10^{16}\\\\E=1.8\times 10^{-17}\ J$

1 kcal = 4184 J

It means,

$1.8\times 10^{-17}\ J=\dfrac{1}{4184}\times 1.8\times 10^{-17}\\\\=4.3\times 10^{-21}\ \text{kcal}$

Hence, this is the required solution.

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3 years ago

An astronaut is free-floating in space near a space station and it is not tethered to anything. He has some tools and a fire ext

worty [1.4K]

Hey there

the answers are

and

D. He could spray the fire extinguisher in the opposite direction of the space station

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7 0

3 years ago

Read 2 more answers

How many moles are in 1.2x10^3 grams of ammonia(NH3) ?

miskamm [114]

Answer : The number of moles present in ammonia is, 70.459 moles.

Solution : Given,

Mass of ammonia = $1.2\times 10^3g$

Molar mass of ammonia = 17.031 g/mole

Formula used :

$\text{Moles of }NH_3=\frac{\text{ given mass of }NH_3}{\text{ molar mass of }NH_3}$

$\text{Moles of }NH_3=\frac{1.2\times 10^3g}{17.031g/mole}=70.459moles$

Therefore, the number of moles present in ammonia is, 70.459 moles.

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2 years ago

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Why is smoke filling up a room diffusion or not diffusion

miv72 [106K]

It is diffistion because it moves from an area of high concentration to low

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3 years ago

Enter the appropriate symbol for an isotope of potassium-39 corresponding to the isotope notation A/Z x

Taya2010 [7]

Appropriate symbol for an isotope of potassium - 39 corresponding to the isotope notion r A ZX

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3 years ago