Amonochromatic light passes through a narrow slit and forms a diffraction pattern on a screen behind the slit. as the wavelength of the light decreases, the diffraction pattern a)spreads out with all the fringes getting wider. b)remains unchanged c)spreads out with all the fringes getting alternately wider and then narrower. d)becomes dimmere)shrinks with all the fringes getting narrower.

the independent variable, or the one that is intentionally manipulated is the speed.

no. dot product   =0 when vecs at right angles

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

the tires are rotating at 0.434 rpmlinear speed=45 m/sdiameter=0.550 mradius=0.275 mnow v= rωω= v/rω=45/0.275ω=163.6 rad/sω=163.6 rad/s (1rev/2π rad) (60s/1m)ω=1563 rpm