Resonance is the response of a standing wave to another wave

The correct answer is "same frequency".

Explanation:

Resonance occurs when the natural frequency of the object matches with the applied frequency.

Standing wave is the stationary wave in which there is an interference of the wave moving in an opposite direction each having same frequency and same amplitude.

Resonance is the response of a standing wave to another wave when the frequency of the both waves are same.

Therefore, the answer is "Same frequency".

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.