Which wave would travel the fastest in a vacuum?
light waves
Which type of wave travels faster?
P-waves and S-waves are body waves that propagate through the planet. P-waves travel 60% faster than S-waves on average because the interior of the Earth does not react the same way to both of them. P-waves are compression waves that apply a force in the direction of propagation.
Which is the slower body wave?
The PP (one bounce) and PPP (two bounces) waves travel more slowly than the direct P because they pass through shallower, lower velocity rocks. The different S waves arrive after the P waves. The slowest (and latest to arrive on seismograms) are surface waves, such as the L wave.
Where does S waves travel?
S waves move rock particles up and down, or side-to-side–perpendicular to the direction that the wave is traveling in (the direction of wave propagation).
What does a notched S wave mean?
Fragmented QRS is defined as the presence of R’ wave or notching of R or S wave in the presence of narrow QRS. It indicates heterogeneous depolarization of the ventricular myocardium that can occur due to ischemia, fibrosis, or scar. It may also be a marker of coronary microvascular dysfunction.
What is fQRS?
Fragmented QRS (fQRS) is a convenient marker of myocardial scar evaluated by 12-lead electrocardiogram (ECG) recording. fQRS is defined as additional spikes within the QRS complex.
Where are T wave inversions normal?
Normal T waves are upright in leads I, II, and V3-V6, inverted in AVR. Less than five mm in limb leads, less than ten mm in precordial leads, and variable presentations in III, AVL, AVF, and V1-V2. [2] This graphical depiction on ECG is associated with lead placement and the electrical pathways of the heart.
Should I worry about inverted T waves?
T-wave inversions in right precordial leads are relatively rare in the general population, and are not associated with adverse outcome. Increased mortality risk associated with inverted T waves in other leads may reflect the presence of an underlying structural heart disease.
Can anxiety cause inverted T waves?
A study by Whang et al. (2014) showed that depressive and anxious symptoms were associated with abnormalities in T wave inversions.
Why do I have inverted T waves?
Inverted T waves. Ischemia: Myocardial ischemia is a common cause of inverted T waves. Inverted T waves are less specific than ST segment depression for ischemia, and do not in and of themselves convey a poor prognosis (as compared to patients with an acute coronary syndrome and ST segment depression).
What do abnormal T waves indicate?
T‐wave abnormalities in the setting of non‐ ST ‐segment elevation acute coronary syndromes are related to the presence of myocardial edema. High specificity of this ECG alteration identifies a change in ischemic myocardium associated with worse outcomes that is potentially reversible.