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____ [38]
3 years ago
12

What is 4.7 rounded to the nearest tenth

Chemistry
2 answers:
Margaret [11]3 years ago
8 0
5.0................ ..
irga5000 [103]3 years ago
7 0

Answer:

The answer is still 4.7

Explanation:

The first digit before a decimal (to the left) is called unit or one. However, the first digit after a decimal (to the right) is called tenth, and the one after that is called hundredth.

when rounding up, any digit greater than 4 will be rounded up to 1 and then added to the preceding number. But when the digit is less than 5, the number is rounded off to 0.

Hence, 4.7 is the same as 4.70 with the "7" being the tenth value and the "0" being the hundredth value. Hence, when 4.7 is rounded to the nearest tenth, it remains as 4.7 because its hundredth value is rounded off to "0" since it is less than "5".

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In IR spectroscopy, we normally talk about "frequencies" when in reality we are referring to wavenumbers. What is the mathematic
Svetach [21]

Answer:

Here's what I get.

Explanation:

(b) Wavenumber and wavelength

The wavenumber is the distance over which a cycle repeats, that is, it is the number of waves in a unit distance.

\bar \nu = \dfrac{1}{\lambda}

Thus, if λ = 3 µm,

\bar \nu = \dfrac{1}{3 \times 10^{-6} \text{ m}}= 3.3 \times 10^{5}\text{ m}^{-1} = \textbf{3300 cm}^{-1}

(a) Wavenumber and frequency

Since

λ = c/f and 1/λ = f/c

the relation between wavenumber and frequency is

\bar \nu = \mathbf{\dfrac{f}{c}}

Thus, if f = 90 THz

\bar \nu = \dfrac{90 \times 10^{12} \text{ s}^{-1}}{3 \times 10^{8} \text{ m$\cdot$ s}^{-1}}= 3 \times 10^{5} \text{ m}^{-1} = \textbf{3000 cm}^{-1}

(c) Units

(i) Frequency

The units are s⁻¹ or Hz.

(ii) Wavelength

The SI base unit is metres, but infrared wavelengths are usually measured in micrometres (roughly 2.5 µm to 20 µm).

(iii) Wavenumber

The SI base unit is m⁻¹, but infrared wavenumbers are usually measured in cm⁻¹ (roughly 4000 cm⁻¹ to 500 cm⁻¹).

8 0
3 years ago
A __________ has distinct properties and composition that never vary.
erik [133]
<h2>Answer </h2>

Matter

<u>Explanation </u>

A matter has distinct properties and composition that never vary. The matter is anything which possesses mass and occupies space. The matter has different characteristics and a distribution that does not change from unit to unit. Materials which cannot be disintegrated into simpler materials. Each is made of only one kind of atom in subatomic level. For example, a chair, table, and similar everything that has mass and occupies space is matter.

3 0
2 years ago
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Which type of radiation involves the conversion of a neutron into a proton?
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Answer:

B. Beta

Explanation:

Neutron -> proton = responsible by Beta particles.

3 0
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20. Which of the following are pure substances?
Juliette [100K]
The answer is III and V
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Each liter of air has a mass of 1.80 grams. How many liters of air are contained in
natita [175]

Question:

Each liter of air has a mass of 1.80 grams. How many liters of air are contained in 2.5 x103) kg of air?

Answer:

11.48106 L

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