In a double-slit experiment, the slit separation is 2.0 mm, and ...

[sarasara]

In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750 nm and 900 nm, illuminate the slits.
 
  A screen is placed 2.0 m from the slits. At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other?
  A) 1.5 mm
  B) 3.0 mm
  C) 4.5 mm
  D) 6.0 mm

Question 2

Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons composing it? Why don't the nucleon masses add up to the total nuclear mass?
 
  A) Greater. We need to add the masses of the surrounding electrons to the masses of the nucleons.
  B) Neither. The mass of the atomic nucleus is exactly the sum of the masses of the nucleons.
  C) Less. The individual nucleons have greater mass when separated from the nucleus. This additional mass is a result of the energy of separation.
  D) Greater. The mass of the atomic nucleus also has mass of the atomic glue that holds the nucleons together in the nucleus.

[onowka]

Answer to Question 1

C

Answer to Question 2

Answer: C

[sarasara]

Gracias!

[Liddy]

Excellent