Answer:
The recoil speed is 
Solution:
Wavelength of a blue-green photon, 
Now, the energy associated with the blue-green photon:

where
h = Planck's constant
C = speed of light ion vacuum


Also, we know that the recoil speed can be calculated by the KInetic energy which is equal to the Energy of the blue-green photon:

where
= velocity of Hydrogen atom
= mass of H-atom
Now,



The first object is also negatively charged that is why people say opposites attract. have a good day!
Phosphorus = 2 atoms
Oxygen = 8 atoms
Barium = 3 atoms
Answer:
Part a)
P = 8.23 kg m/s
Part b)
v = 3.05 m/s
Explanation:
Part a)
momentum of cart 1 is given as


Momentum of cart 2 is given as


Now total momentum of both carts is given as


Part b)
Since two carts are moving towards each other due to mutual attraction force and there is no external force on two carts so here momentum is always conserved
so here we will have


