Tutor profile: Shivani M.
As you move from left to right on a periodic table, how does the atomic radius change? How does the atomic radius change going down a group?
As one moves from left to right on a periodic table, the size of the atoms decreases due to the increased nuclear attractive force from the increase of protons, cause the electron cloud to be pulled towards the center, condensing the size. As one moves down a group, the number of shells increases and more electron shielding occurs, causing reduced nuclear attractive force on the valence elections. This in turn leads to the atomic radius increasing going down a group.
In a cardiac potential, there is a plateau phase where the membrane potential is almost constant. What is the purpose of this plateau phase?
The prolonged membrane action potential with the plateau phase allows for the ventricles to fill with blood and build muscle tension in order to contract and sufficiently push blood out of the heart.
In an electric circuit, voltmeters are used to measure the electrical potential difference between two points. Should the voltmeters be connected in parallel or in series to the circuit?
Voltmeters are connected in parallel to the circuit because voltmeters have very high resistance and therefore should not be connected in series or the circuit conditions could be compromised. As per Kirchhoff's Voltage Law (Closed Loop Rule), any path taken in a close loop will have the same potential difference. In other words, the path taken via the voltmeter will read the same potential difference as the path that bypasses the voltmeter. Therefore, the voltmeter must be connected in parallel to allow for the two paths.
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