
The earth has a radius of . The inner core ofradius is solid. Outside it, there is a region from to a radius of which is in the molten state. Then again from to the earth is solid. Only longitudinal waves can travel inside a liquid. Assume that the wave has a speed of in solid parts and of in liquid parts of the earth. An earthquake occurs someplace close to the surface of the earth. Calculate the time after which it will be recorded in a seismometer at a diametrically opposite point on the earth if wave travels along diameter.

Important Questions on Waves

Given below are some functions of and to represent the displacement of an elastic wave.
(a)
Determine the type of wave.

Given below is a function of and to represent the displacement of an elastic wave.
State which of the following conditions represent the given equation.
(a) a travelling wave along –x direction
(b) a stationary wave
(c) beats
(d) a travelling wave along +x direction

Given below are some functions of and to represent the displacement of an elastic wave.
State which of the following conditions represent the given equation.
(a) a travelling wave along –x direction
(b) a stationary wave
(c) beats
(d) a travelling wave along +x direction

Given below are some functions of and to represent the displacement of an elastic wave.
State which of the following conditions represent the given equation.
(a) a travelling wave along –x direction
(b) a stationary wave
(c) beats
(d) a travelling wave along +x direction

In the given progressive wave where are in and is in seconds, What is the amplitude?

In the given progressive wave where are in and is in seconds, What is the
(b) wave length

In the given progressive wave where are in and is in seconds, What is the
(c) frequency
