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nikdorinn [45]
3 years ago
6

Examine the spectra of the four unknown substances shown below. What can you conclude?

Physics
2 answers:
oksian1 [2.3K]3 years ago
7 0
Line spectra are obtained when individual elements are heated using a high-voltage electrical discharge. This heating causes excitation of the element and a subsequent emission of distinct lines of colored light are obtained. Each element has its own unique emission line spectrum; therefore, if any of the tested substances were the same, their spectra would match. However, this is not the case so none of the substances are the same.
 hope it helps!
makvit [3.9K]3 years ago
5 0
<span>Substances X and Z are the same.


Hope this helps</span>
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How long does it take for a train to increase its velocity from 10m/s to 40m/s if it accelerates at 3 m/s
DIA [1.3K]

Answer:

Explanation:

Givens

Vi = 10 m/s

Vf = 40 m/s

a = 3 m/s^2

Formula

a = (vf - vi) /t              Substitute the givens into this formuls

Solution

3 = (40 - 10) / t          Multiply both sides by t

3*t = t(40 - 10)/t        Combine. Cancel t's on the right

3*t = 30                     Divide by 3

3t/3 = 30 / 3

Answer: t = 10 seconds.

6 0
2 years ago
In non-ferromagnetic materials, most of the electrons are _____.
OleMash [197]

It hink that it is the 2nd one

7 0
3 years ago
Read 2 more answers
A heat engine operates between two reservoirs at 300K. During each cycle, it absorbs 200 calories from the high temperature rese
yanalaym [24]

(a) Zero

The maximum efficiency (Carnot efficiency) of a heat engine is given by

\eta=1-\frac{T_C}{T_H}

where

T_C is the low-temperature reservoir

T_H is the high-temperature reservoir

For the heat engine in the problem, we have:

T_C = 300K

T_H = 300K

Therefore, the maximum efficiency is

\eta=1-\frac{300}{300}=0

(b) Zero

The efficiency of a heat engine can also be rewritten as

\eta = \frac{W}{Q_H}

where

W is the work performed by the engine

Q_H is the heat absorbed from the high-temperature reservoir

In this problem, we know

\eta=0

Therefore, since the term Q_H cannot be equal to infinity, the numerator of the fraction must be zero as well, which means

W = 0

So the engine cannot perform any work.

5 0
3 years ago
What characteristics do atoms of carbon-12, carbon-13, and carbon-14 have in common? 1. same number of electrons 2. same number
Rasek [7]

Answer:

The most common of these is carbon 12, 13, 14. All of these isotopes have the same atomic number but different mass numbers. Carbon has the atomic number of 6 which means that all isotopes have the same proton number. However, the number of neutrons is different, thus giving different mass numbers.

7 0
3 years ago
Which object is probably composed of ice and dust?
Setler [38]

I think comets because they are small and they are composed of ice or water. Hope it helps :)

7 0
3 years ago
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