An object B is projected upwards from a height of 60m above the ground with a velocity of 20ms-1 at 30° to the horizontal. At the same time, an object Q is projected from the ground
upwards towards B at 30° to the horizontal. If B and Q collide, at a height of 60m above the
ground while they are both moving downwards,
1) Find the speed of projection of Q
2) The kinetic energy of B just before colliding with Q if it's mass is 1/2kg.
3) The horizontal distance between the points of projection.​

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

that would be because of both gravity and friction. so     c

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia