1)What is the direction of the Poynting vector of an electromagnetic wave? a)It

ID: 2294381 • Letter: 1

Question

1)What is the direction of the Poynting vector of an electromagnetic wave?

a)It is perpendicular to the direction of travel and parallel to the magnetic field vectors.

b)It is perpendicular to the direction of travel and parallel to the electric field vectors.

c)It is opposite the direction of travel.

d)It is in the direction of travel.

2)Which is true about the primary rainbow?

a)Light refracts into the water drops and then reflects once before it refracts out.

b)Light refracts into the water drops and then reflects twice before it refracts out.

c)Light refracts into the water drops and then reflects three times before it refracts out.

3)A light ray is incident on an interface at the critical angle and the index of refraction is less on the other side. Which is true?

a)The angle of refraction is 0

1) d

2) b

3) b

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