Which combination of characteristics produces the LEAST energetic waves? .
A. short wavelength, low frequency
B. short wavelength, high frequency
C. long wavelength, low frequency
D. long wavelength, high frequency

C.

long wavelength, low frequency

Explanation:

The energy of wave depends on the wave frequency and wave amplitude.

The Wave energy can also be determined by wavelength, wave speed, amplitude, water density e.t.c

According to the question that

Which combination of characteristics produces the LEAST energetic waves ?

The correct option will be

C. long wavelength, low frequency

Option C is therefore the correct answer.

second mirror gathers light from a faraway object and reflects it to another mirror. - a.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.