Answer
As the angle of incidence increases in Figure 2.8, a point is finally reached where the refracted ray does not emerge at the second layer but lie along the interface. This particular angle of incidence at which the angle of refraction is 90° and the refracted ray lies along the interface is known as the critical angle. At and beyond the critical angle, there is no transmitted ray and therefore a very high reflected ray will be recorded .
Therefore,
sinθisin90=Vp1Vp2
But, sin 90 = 1.
At critical angle,
sinθcritical=Vp1Vp2
A critical refracted wave travels along the interface between layers and is refracted back into the upper layer at the critical angle. The waves refracted back into the upper layer are called head waves or first-break refractions because at certain distances from a source, they are the first arriving energy. Recorded first-break refraction is shown in Figure 2.10.
Note that these first-break refractions can give us important information about the shallow velocities on land seismic data.
Note also that seismic data are acquired in such a way that reflections from horizons of interest are in the pre-critical region, even at the farthest offset in the data.
In reality, part of the seismic energy arriving at an interface is transmitted and refracted, and another part of the energy is reflected at that same interface. Given that there are many reflectors in the subsurface, there will be many paths from source to receiver, each of them with a different travel time. The proportion of energy reflected depends on the material properties of the two bounding layers and on the angle of incidence
Answer:
The power is 24 watt .
Explanation:
Given that,
Voltage V= 12-V
Current I = 2.0 A
Using ohm's law
The current is directly proportional to the voltage.
In form of power,
The power is the product of the Current and voltage.
Formula of the power is defined as,
Hence, The power is 24 watt .
Answer:
5.25
I think that's it but km really sorry if I'm wrong so...
Explanation:
6km/1 hr= 6km per hour
9km/2 hr= 4.5 km per hour
6km/1 hr+4.5 km/1 hr= 10.5km/2 hr
5.25
Answer: constructive interference
Explanation: plz mark Brainly
Answer:
ground
Explanation:a conductor connected directly to the earth is called a ground
