A sound technician is testing the sound acoustics in a theatre for an upcoming music concert. He sets up speakers in different locations and tests the sound levels in various seats in the theater. In one seat, the sound is twice as loud as it is in other seats in the theater. What wave phenomenon best explains why the sound is louder in one seat compared to the others?

Diffraction between speakers

Reflection off the theater walls

Constructive interference

Destructive interference

Constructive interference.

Explanation:

The previous answer is incorrect. A simple google will tell you that diffraction will result in a quieter sound. Constructive interference is where 2 sounds of similar wave length will add up to nearly double the amplitude.

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards