a particle of mass 200gm executes SHM. the restoring force is provided by a spring of force constant 80N/m. the time period of oscillation is?

time period of oscillation is 0.31 seconds

Explanation:

we shall know the formula:

 ......where m is mass and k is force constant.

change 200gm into kg, then it will be 0.2 kg

T = 2π√0.2÷80

T = 0.314 seconds

T = 0.31 seconds rounded to 2 decimal places.

0.11 m/s and 0.28 m/s should be correct

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