The correct answer is: a. Environmental journalist
An environmental journalist is someone who collects information about matters relevant to the environment, and reports or publishes this information in journals, magazines and reports. On the other hand, environmental physicians, designers and engineers are not involved in collecting information regarding the environment. Instead they focus on designing and building tools and structures that benefit and conserve the environment. Thus, the correct answer is A: An environmental journalist's career involves collecting information about how human events impact the environment.
The difference between metal and non-metal in terms of condition is explained below.
Explanation:
- In metals, conduction occurs due to the aggregation of vibrations of molecules and free-electron distribution. While in non-metals, the mechanism for conduction is only atomic or molecular vibrations.
- Apart from free electrons, there are phonons in metals as well as non-metals. Non-metals hold a confined amount of thermal conductivity only due to Phonons and Lattice vibrations.
- Concerning atomic vibration in a solid thing (non-metals mainly), it is easier to know if one receives the fact that atoms are almost floating adjacent to one another depending on the covalent bonds between them.
- When a metal is heated the electrons quickly respond to the heat and transfer it to the nearby atom or solid touching it. As non-metals don't possess free electrons, the heat transfer happens due to phonons (the excited state of the lattice structure vibrating uniformly).
- In metals, this rarely plays a role as the electrons transfer most of the heat efficiently.
Answer:
7.81 moles of Neon.
Explanation:
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms. This simply means that 1 mole of Neon also contains 6.02×10²³ atoms.
From the above illustration, we can convert 4.7×10²⁴ atoms of Neon to moles. this is illustrated below:
6.02×10²³ atoms = 1 mole
Therefore,
4.7×10²⁴ atoms = (4.7×10²⁴ × 1)/6.02×10²³
4.7×10²⁴ atoms = 7.81 moles
Therefore, 4.7×10²⁴ atoms of Neon is equivalent to 7.81 moles of Neon.
<span>The number of oscillations that a wave completes per unit of time is called "frequency".
Frequency represents in fact how many complete cycles of the wave are done in a single unit of time. It can be written also as
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Answer: 204.29 *10^-6 J
Explanation: In order to explain this question we have to consider to following expression for the potencial and electric field in a capacitor, which is given by;
E*d=V where d is the separation between plates and E and V are the electric field and the voltage difference in the plates.
For the maximun electric field, V max es equal
Vmax=Emax*d= 222*10^3 *1.96*10^-3=435.12 V
We also know that potential energy stores by a capacitor with a constant dielectric κ is given by:
E=0.5*C*V^2, where C is the capacity and V the voltage.
For two plates capacitor C is equalk to:
C= k*ε*A/d where A and d are the area and the separation in the capacitor. εo is a constant equal 8.85*10^-12 F/m
Then;
E=[(0.5*5.85*8.85*10^-12*0.0817)/(1.96*10^-3)]*(435.12)^2= 204.29 *10^-6 J