What does newton's third law say about why momentum is conserved in collisions?

1. equal forces act for unequal times, so the change in momentum for both objects must be equal.
2. unequal forces act for unequal times, so the change in momentum for both objects must be unequal.
3. unequal forces act for unequal times, so the change in momentum for both objects must be equal.
4. equal forces act in equal times, so the change in momentum for both objects must be equal.

Option 4 is the correct answer.

Explanation:

I think you've heard that for every force, there is equal and opposite force.

So, option 2 and 3 will be wrong because unequal force is included in the answer.

Actually, both objects are exerting equal magnitude of force to each other throughout the duration of contact.

Now,

For forces to be equal, time of contact must also be equal.

So, option 4 is right.

option 4 is correct

Explanation:

Equal forces acts in equal times,so the change in momentum for both objects must be equal

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m