What corresponds to a line showing the direction in which the wave transfers evergy?

Which device helps on demonstrating motion of wavefronts?

The loudness of a sound wave or the brightness of a light does not depends on the amount of energy that is received by an observer.

The energy E is found to be proportional to the square of the amplitude A.

Loudness and brightness are each affected by frequency.

What is the intensity of a wave at 12m from point source with a power of 2500W?

When two or more waves meet the total displacement is the algebraic sum of their individual displacements.

Most naturally occurring electromagnetic waves are completely polarized.

Soundwaves can be polarized.

Reflected rays are NOT in the same plane as the incident ray.

The angle of incidence is equal with the the angle of reflection.

Calculate the angle of refraction when the angle

Of incidence at a glass surface is 25°(refractive index of the crown glass = 1 .52 and air is 1.00).

The speed of light in an unknown medium is measured to be 1.2 x 10^8 m/s. What is the index of refraction of the medium?

Calculate the critical angle for a material of absolute refractive index 1.35.