Circular water wavCircular water waves decrease in amplitude as they move away from where a rock is dropped. Explain why.es decrease in amplitude as they move away from where a rock is dropped. Explain why.
The energy of the circular waves created in water keeps on decreasing as the water molecules along the waves keeps on interacting with each other and as a result amplitude of wave decreases.
When a rock is dropped at a point in a standing wave, it creates disturbance in the water at that point. This disturbance is then propagated radially outwards in all directions in the form of circular waves.
When a rock with a kinetic energy touches the water, the kinetic energy gets converted into wave motion. As the wave propagate radially, the water molecules on the surface of water produces friction (known as viscosity) while interacting with the molecules inside the surface of water. As a result the energy in the wave motion start getting absorbed by the water molecules as they move away from the point of impact of the rock.
Wave’s energy is directly proportional to the square of its amplitude. Hence if the energy of wave motion decreases, its amplitude will also decrease in the process.
That is why circular water waves decrease in amplitude as they move away from where a rock is dropped.
(a) What is the intensity in W/m2 of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 500 J of energy into a circular spot 2.00 mm in diameter in 4.00 s?
(b) Discuss how this intensity compares to the average intensity of sunlight (about 700 W/m2) and the implications that would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure.
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