Question

Which one of the following statements concerning electromagnetic (EM) waves is FALSE? Also expalin your reasoning.

(A) The electric and magnetic fields in EM waves are always perpendicular to each other.

(B) Higher frequency waves have more energy than lower frequency waves.

(C) EM waves move slower in high-index-of-refraction media.

(D) The index of refraction of a medium varies with the wavelength of the incident EM wave.

(E) The frequency of EM waves decreases in regions with higher index of refraction.

Answer 1

(A)

TRUE, The electric and magnetic fields in EM waves are always perpendicular to each other

(B)

E = hf

energy is directily proportional to frequency so,  Higher frequency waves have more energy than lower frequency waves

TRUE

(c)

v= c/n

speed of waves invesily proportional to index of refraction

so high index of refraction waves moves slower , so this statment also true

(d)

Materials with a high index of refraction have

a higher reflectivity than materials with

a low index. Because the index of refract

ion varies with the wavelength of the

photons, so does the reflectivity

so it is also true

(e)

higher index of refracton decrease wavelength which increases frequency of EM wave

so, it is false

option (E) is correct answer