Which of the following describes fibers? metal wires having relatively large diameters. single crystals with extremely large length-to-diameter ratios. polycrystalline and amorphous materials with small diameters.

Polycrystalline and amorphous materials with small diameters is the correct answer.

Explanation:

Polycrystalline and amorphous materials with small diameters describes fibers.

Fiber is used to transfer information from one point to another by transmitting light pulses with the help of optical fiber.

In the aspect of length/ diameter ratio, fiber has too low diameter and length is large and also has large strength.

Generally, the length of fibers is quite high and the diameter is very low as compared to length.

It is very beneficial for long-distance conversations because light delivers by the fiber with very low attenuation compared to the electrical wires.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.