1. A photon of yellow light has a wavelength of 6.20 x 10-7 m. Calculate the photon's momentum. 

2. A 12 gram bullet leaves the barrel of a rifle at 180 m/s. If the vertical position of the bullet is known to a precision of 0.65 cm (radius of the rifle's barrel), 2. What is the minimum uncertainty in the bullet's vertical momentum? 

3. An electron with an energy of 8.0 eV is incident on a potential barrier 9.2 eV high and 0.25 nm wide. What is the probability that the electron will pass through the barrier? (Probability is a number between zero and 1. Do not answer as a percentage). What is the probability that the electron will be reflected?