Two electronic oscillators are making some sine waves, at frequencies f1 = 882 hz and f2 = 880 hz. at a certain point, the sound level from one alone would be sil 1 = 76 db, and from the other sil 2 = 82 db. how often do beats occur

As we know that when two sound sources of slightly different frequency sound together then we will have resultant sound intensity changes with time

this is known as Beats

in order to find the beat frequency we will use

here we know that

now here we know that from above formula

now from this equation we can say that we will hear 2 beats per second

so time interval between two beats is given as

2b2t

explanation:

2b2t

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