The answer is c you got to look for answers that make sense
As the distance between two magnets increases, the force between them <em>decreases</em>.
If the force increased along with distance, then the magnet in your hand would reach out
and grab every magnet in Australia or on Mars and pull it toward you.
There are a few ways to do this- unfortunately different fields are better at it than others! Medical research is generally pretty good, some other fields likewise very good, some not as much.
Basically, though, what they do is use standadisation- they agree on the terminology, units of data, statistical measures, and so forth, that will be used in that scientific field. As much as possible, every scientist in the field uses those standards so everyone working in the field should recognise it.
For instance, in clinical trials, there is very good agreement worldwide on what the different metrics we use are- e.g. in cancer research, we usually want to know the 5-year survival rate (meaning the percentage of patients still alive 5 years after diagnosis). So anyone with the right training should be able to pick up a clinical trial report and understand what the results are and what the report is saying.
Answer:
416,500 J – 67,200 J = 349,300 J
The potential energy at the top of the second hill is 349,300 joules.
Answer:
B blue
Explanation:
This is an exercise of photoelectric effect where electrons are removed from the metal by the incident radiation, the explanation of this phenomenon was given by Einstein, they assume that the light is formed by quanta and these collide with the electrons promoting their transfer; The equation that describes the process is
= h f - Φ
Whereis the kinetic energy, maximize the electrons started, h the plan constant, f the frequency and Φ the work function of the metal (link energy)
The radiation with the lowest energy that an electron can start
h f = Φ
Let's analyze the energy of the light rays with the wavelength
c = λ f
f = c / λ
λ red = 700 10⁻⁹ m
f = 3 108/700 10⁻⁹
f₁ = 4.29 10¹⁴ Hz
Yellow λ = 600 10⁻⁹ m
f₂ = 3 108/600 10⁻⁹
f₂ = 5 10¹⁴ Hz
λ blue = 450 10⁻⁹ m
f₃ = 6.67 10¹⁴ Hz
In the initial metal with a work function fi1 yellow light was needed, to start the electrons, when analyzing the initial equation if the work function increases Φ₂> Φ₁ more energy is needed to take out the electrons from the atom (E₂>E₁)
light of greater energy (frequency) than yellow is needed so that light is needed to go BLUE