The impulse experienced by a body is equivalent to the body’s change in

Momentum

The momentum of a particle is defined as the product of the particle mass and the particle velocity as follows:

On the other hand, the impulse of a constant force is defined as:

We also know that the net force acting on  a particle equals the rate of change  of the particle’s momentum, so:

If the force is constant, then equals the total change in momentum over a period of time:

wavelength variability is the right one

the answer is a)

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