1 poir 4) A ray of light passes from a medium X to another
medium Y. No Bending/refraction of light occurs if the
ray of light hits the boundary of medium Y at an angle
of:
(a) 120°
(b) 90°
(c) 45°
(d) 0°

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

What is friction? how does it affect the motion of an object?

An electromagnetic wave with frequency 65.0 hz travels in aninsulating magnetic material that has dielectric constant 3.64 andrelative permeability 5.18 at this frequency. the electric fieldhas amplitude 7.20 \times 10^{ - 3} {\rm v}/{\rm m}. a. what is the speed of propagation of the wave? b.what is the wavelength of the wave? c.what is the amplitude of the magnetic field? d.what is the intensity of the wave?