1 what is blind spot?
2 describe the interior of the earth?
3 Define frequency and amplitude?
Answers
Answer:
1) Blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area.
2) Inside the Earth
The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball, about 1,500 miles (2,400 kilometers) in diameter. ... Above the inner core is the outer core, a shell of liquid iron.
3) frequency is the number of waves per second.
its SI unit is Hertz it is divided into two main categories which are infrasonic and ultrasonic
amplitude is is the maximum distance between the crest and trough a wave its SI unit is metre
hope it helps you mate
BLIND SPOT :
The optic nerves and the retinal arteries enters the eye through a point slightly below the posterior end of the eye ...
That point is devoid of photo pigments like rods and cones ...
Therefore that point is known as Blind spot ..
INTERIOR PART OF THE EARTH ...
Earth's interior is generally divided into three major layers: the crust, the mantle, and the core.
The hard, brittle crust extends from Earth's surface to the so-called Mohorovicic discontinuity, nicknamed the Moho.
The Moho is not located at a uniform depth, but about 10 kilometers (6 miles) below the seafloor and about 35 kilometers (22 miles) beneath the surface of continents.
Beneath the Moho is the mantle, the viscous layer that makes up more than half of Earth's volume.
The mantle is divided from the core by the Gutenberg discontinuity, about 2,880 kilometers (1,798 miles) beneath Earth's surface.
The outer core is molten and liquid iron and nickel, while the inner core is solid and much more dense than either iron or nickel at the surface...
FREQUENCY :
Frequency is the number of occurrences of a repeating event per unit of time.
It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency.
Frequency is measured in units of hertz (Hz) which is equal to one occurrance of a repeating event per second.
AMPLITUDE:
Description
The amplitude of a periodic variable is a measure of its change over a single period.
There are various definitions of amplitude, which are all functions of the magnitude of the differences between the variable's extreme values.
In older texts the phase is sometimes called the amplitude.