What are the options for A,B,C,D? There’s arrows
<em>Water pipes burst because the water inside them expands is it gets close to freezing, and this causes an increase in pressure inside the pipe. When the pressure gets too high for the pipe to contain, it ruptures.</em>
Answer:
From the highest to the lowest
Third excited state (n=4) Second excited state (n=3) First excited state (n=2) Ground state (n=1)
Explanation:
The Bohr Model, by Niels Bohr, is a planetary model in which the negatively charged electrons orbit a small, positively charged nucleus similar to the planets orbiting the sun. Niels Bohr in his model states that:
- The electron is able to revolve in certain stable orbits around the nucleus without radiating any energy
- Electrons can only gain and lose energy by jumping from one allowed orbit to another, absorbing or emitting electromagnetic radiation with a frequency ν determined by the energy difference of the levels according to the Planck relation: = hv, where h = planck's constant.
The lowest value of n is 1, which is the ground state
n = principal quantum number
Therefore, from the highest to the lowest, the energy levels are ranked as:
Third excited state (n=4)
Second excited state (n=3)
First excited state (n=2)
Ground state (n=1)
The force of earth gravity on the space craft is 1.19 N
\begin{array}{c}
F = \frac{{GMm}}{{{{\left( {r + h} \right)}^2}}}\\
= \frac{{6.67 \times {{10}^{ - 11}} \times 6 \times {{10}^{24}} \times 1050}}{{{{\left( {\left( {6400 + 12800} \right) \times {{10}^3}} \right)}^2}}}\\
= 1.139\;{\rm{N}}
\end{array}$
Hence, the force of gravity on the space craft is 1.19 N.
Answer: Photoelectric wave
Explanation: Because it represents an interaction between light and matter that describes light as an electromagnetic wave.