What is the distance in air from the boundary to the nearest minimum of the electric field intensity

The independent variable in this experiment is the angle at which the light from the ray box strikes the mirror.hope this .

Hey did u get the answer?

The correct option is this: the sound waves from the two trombones have slightly different frequencies.from the question given above, we are told that the loudness of the sounds were increasing and decreasing, this is because the frequencies of the two sounds are different. the means that the number of waves that pass a fixed point in a given amount of time differ for both sounds.