Which statement about the Mercalli scale is true?
2 answers:
Answer:
The statement true about the Mercalli scale is "The scale rates an earthquake according to how much damage it causes."
Explanation:
The Mercalli Scale is a way to rate the earthquakes according to the level of damage at a given place. It got its name after the Italian seismologist Giuseppe Mercalli . The scale has 12 divisions. Lower numbers indicate intensity that is likely felt by people where as the higher numbers indicates the damage to structures and buildings. The ratings are given in Roman numerals. This scale is presently called as the MMI scale, or the Modified Mercalli scale.
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Attached is the image of the concerned ECG reading.
In reading the ECG, first you read the heart rate. To read the heart rate, you must count for the number of small boxes in between QRS complexes, specifically R-R intervals. These number of small boxes will then be used to divide 1500. In this example, there are 20 small boxes between R-R intervals. 1500 divided by 20 is 75, so the heart rate of this ECG reading is 75 beats per minute.
<em>Another way, albeit less accurate, is to count the big squares between R-R intervals and instead of dividing it by 1500, you divide it by 300.</em>
In reading the ECG, first you read the heart rate. To read the heart rate, you must count for the number of small boxes in between QRS complexes, specifically R-R intervals. These number of small boxes will then be used to divide 1500. In this example, there are 20 small boxes between R-R intervals. 1500 divided by 20 is 75, so the heart rate of this ECG reading is 75 beats per minute.
<em>Another way, albeit less accurate, is to count the big squares between R-R intervals and instead of dividing it by 1500, you divide it by 300.</em>