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Physics Guru is an online education and competitive examinations preparation portal founded by Manish Verma, an IIT Madras alumnus, providing learning resources for competitive examinations.

The emphasis is on conceptual understanding, analytical thinking and problem solving rather than simply memorising formulas and standard methods.

The objective is to help students understand what they are learning and develop the ability to solve problems they have not seen before.

Tsunami

A few points:

Tsunami originally is a Japanese word.
Tsu = Harbour
Nami = Wave

The waves travel at a very high speed (around 890 Kmph) in the deep sea region.

The speed is a decreasing function as one move towards shore.

However, they are not noticed even if one is present in a large ship in the deep sea. Why? The height of the wave is just a few inches in the deep sea. It reaches the shore rapidly (note the magnitude of the speed). And when it does, the height of the wave may become astronomically high.