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kiruha [24]
3 years ago
12

Two of the types of ultraviolet light, UVB and UVC, are both components of sunlight. Their wavelengths range from 280 to 320 nm

for UVB and from 100 to 280 nm for UVC. Compare the energy of microwaves, UVB, and UVC. Rank from greatest to least energy per photon. To rank items as equivalent, overlap them.
Chemistry
1 answer:
Dvinal [7]3 years ago
4 0

Answer:

UVC > UVB > microwaves

Explanation:

Let's consider the following radiations with their ranges of wavelengths (λ).

  • Microwaves: 1 mm - 1 m
  • UVB: 280 nm - 320 nm
  • UVC: 100 nm - 280 nm

The energy of a photon (E) can be calculated using the Planck-Einstein's equation.

E = h . c . λ⁻¹

where,

h is the Planck's constant

c is the speed of light

As we can see, <u>the shorter the wavelength, the more energy the photon has</u>. The rank from greatest to least energy is UVC > UVB > microwaves.

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The temperature of gas is 100 K and its volume is 500 ml. If the volume is increased to 1000.0 ml, what is the new temperature o
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A concept is the general idea of objects, events, animals, or people based on common features, traits, or characteristics. Pleas
11Alexandr11 [23.1K]

Answer:

This question is asking whether the statement is TRUE OR FALSE

THE ANSWER IS TRUE

Explanation:

A concept, as rightly defined, is the general idea of an entity, which can include objects, events, animals, or people based on common features, traits, or characteristics. Hence, the CONCEPT of something refers to a a generalized idea about that particular thing.

A concept in other words is our thought about something i.e. how we conceive or think that thing to be. Concept is a phenomenon of the "MIND" since it is abstract and cannot be seen. Based on this, the definition given in the question is TRUE.

7 0
4 years ago
Gold has an atomic weight of 196.97 g/mol, and a density of 19.3 g/cm3. Approximately how many atoms are in a spherical gold nan
ale4655 [162]

<u>Answer:</u> The number of atoms in spherical gold nano particle are 26.918\times 10^4

<u>Explanation:</u>

  • To calculate the volume of sphere, we use the equation:

V=\frac{4}{3}\pi r^3

where,

r = radius of the sphere = 10nm=10^{-6}cm    (Conversion factor:  1nm=10^{-7}cm )

Putting values in above equation, we get:

V=\frac{4}{3}\times 3.14\times (10^{-6})^3\\\\V=4.19\times 10^{-18}cm^3

  • To calculate mass of of the substance, we use the equation:

\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}

Volume of gold = 4.19\times 10^{-18}cm^3

Density of gold = 19.3g/cm^3

Putting values in above equation, we get:

19.3g/cm^3=\frac{\text{Mass of gold}}{4.19\times 10^{-18}}\\\\\text{Mass of gold}=8.0867\times 10^{-17}g

  • To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Mass of gold = 8.8067\times 10^{-17}g

Molar mass of gold = 196.97 g/mol

Putting values in above equation, we get:

\text{Moles of gold}=\frac{8.8067\times 10^{-17}g}{196.97g/mol}=4.47\times 10^{-9}moles

  • According to mole concept:

1 mole of an element contains 6.022\time 10^{23}  number of atom

So, 4.47\times 10^{-19} moles of gold will contain = 4.47\times 10^{-19}\times 6.022\times 10^{23}=26.918\times 10^4 number of atoms.

Hence, the number of atoms in spherical gold nano particle are 26.918\times 10^4

8 0
3 years ago
How many grams of NH3 can be produced from 4.89 mol of N2 and excess H2.
Svetllana [295]

Answer:

166.56g of NH3 are produced

Explanation:

The reaction of N2 with H2 to produce NH3 is:

N2 + 3H2 → 2NH3

<em>Where 1 mole of N2 produce 2 moles of NH3</em>

<em />

4.89 moles of N2 with excess of H2 produce:

4.89 moles N2 * (2 moles NH3 / 1 mole N2) = 9.78 moles NH3

As molar mass of NH3 is 17.031g/mol, mass of NH3 produced is:

9.78 moles * (17.031g / mol) =

<h3>166.56g of NH3 are produced</h3>
3 0
3 years ago
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