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3 years ago

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A quantum system has three energy levels, so three wavelengths appear in its emission spectrum. The shortest observed wavelength

is 218 nm ; light with a 454 nm wavelength is also observed. What is the third wavelength?

1 answer:

zhenek [66]3 years ago

8 0

The atoms of a molecule can vibrate in many waysthese are called the normal modes of vibration. The normal modes have different excitation energies so the Raman spectrum will consist of more than one line. The number of normal modes is easily deduced; if the number of nuclei in the molecule is N, then the total number of degrees of freedom (i.e., the number of coordinates required to specify the positions of all of the nuclei) is 3N. Of these, three account for translation of the molecule as a whole and three more for its rotation. So the third is 314 nm

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Select the true statements: check all that apply check all that apply oxidizing agents can convert co into co2. a reducing agent

andrew11 [14]

Answer:

1.) True

2.) True

3.) False

Explanation:

1.) Oxidizing agents can convert co into co2.

This is true

Carbon monoxide burns in the oxygen to produce carbon dioxide

2.) A reducing agent gets oxidized as it reacts.

This is true

Because it loses electrons and is oxidized in a chemical reaction.

3.) If something is reduced, it is formally losing electrons.

This is false.

If something is reduced, it is gaining electrons.

7 0

3 years ago

How much heat is contained in 100 kg of water at 60.0 °C?

attashe74 [19]

First we need to write down heat capacity for water which is constant.
cp=4186 J/(kg*K)

The equation for Energy that we will be calculating is:

E=cp*m*T
where m is mass and T is absolute temperature (273,15 + 60 in this case). Replacing all the values in equation we get:

E = 4186*100*333,15 = 139 456 590 J

6 0

3 years ago

g Two cars, car 1 and car 2 are traveling in opposite directions, car 1 with a magnitude of velocity v1=13.0 m/s and car 2 v2= 7

bogdanovich [222]

Answer:

When they are approaching each other

$f_a = 2228.7 \ Hz$

When they are passing each other

$f_a = 2100Hz$

When they are retreating from each other

$f_a = 1980.7 Hz$

Explanation:

From the question we are told that

The velocity of car one is $v_1 = 13.0 m/s$

The velocity of car two is $v_2 = 7.22 m/s$

The frequency of sound from car one is $f_e = 2.10 kHz$

Generally the speed of sound at normal temperature is $v = 343 m/s$

Now as the cars move relative to each other doppler effect is created and this can be represented mathematically as

$f_a = f_o [\frac{v \pm v_o}{v \pm v_s} ]$

Where $v_s$ is the velocity of the source of sound

$v_o$ is the velocity of the observer of the sound

$f_o$ is the actual frequence

$f_a$ is the apparent frequency

Considering the case when they are approaching each other

$f_a = f_o [\frac{v + v_o}{v - v_s} ]$

$v_o = v_2$

$v_s = v_1$

$f_o = f_e$

Substituting value

$f_a = 2100 [\frac{343 + 7.22}{ 343 - 13} ]$

$f_a = 2228.7 \ Hz$

Considering the case when they are passing each other

At that instant

$v_o = v_s = 0m/s$

$f_o = f_e$

$f_a = f_o [\frac{v }{v } ]$

$f_a = f_o$

Substituting value

$f_a = 2100Hz$

Considering the case when they are retreating from each other

$f_a = f_o [\frac{v - v_o}{v + v_s} ]$

$v_o = v_2$

$v_s = v_1$

$f_o = f_e$

Substituting value

$f_a = 2100 [\frac{343 - 7.22}{343 + 13} ]$

$f_a = 1980.7 Hz$

7 0

3 years ago

What is a formula unit

Nana76 [90]

A formula unit is the empirical formula for an ionic compound. It is the lowest possible ratio of the cations and anions of a given ionic compound.

3 0

3 years ago

What is the shape of a solid?

aleksandrvk [35]

Answer:

3d shape is the shape of solid

6 0

3 years ago