Final answer:
True, the Office 365 Admin Application provides push notifications for both planned and unplanned outages, and a pebble dropped in water is an example of a pulse wave.
Step-by-step explanation:
The Office 365 Admin Application does provide push notifications for both planned and unplanned outages, so the statement is True. These notifications can be extremely useful for admins to stay informed about the status of the services they manage. When a pebble is dropped in water, the disturbance it causes sends ripples outward in all directions, which indeed constitutes a pulse wave. The concept here is related to Physics and wave motion, where a pulse wave is typically a single disturbance that moves through a medium, such as water after a pebble is dropped in it.