Nucleus detectors

The atomic number of Neptunium (Np) is _____.

The mass number of Neptunium (Np) is _____.

Complete the nuclear equation and determine the type of decay that is occurring in this reaction. 

• alpha
• beta
• gamma
• none

Which of the following substances can be used as a moderator in a nuclear reactor?

• Boron

• Concrete

• Uranium-238

• Water

In the nuclear equation below, calculate the mass number of the alpha particle. 
^238₉₂U-->^234₉₀Th + ^4₂He + 2^0₀

• 238
• 0
• 234
• 4

What is the number of neutrons in Cesium?

• 55 neutrons

• 76 neutrons

• 84 neutrons

• 106 neutrons

• 139 neutrons

The lengths of the drift tubes in a LINAC are in the ratio

• 1:2:3

• 1:1.414:1.732

• 1:4:9

• 1:1:1

All baryons are assigned a baryon number of ___, all anti-baryons are assigned ___, and all non-baryons are ___

• -1, +1, 0

• -1, 0, +1

• +1, -1, 0

• 0, -1, +1

The atomic number of a given element is equivalent to which of the following?

• Proton number in the nucleus

• Neutron number in the nucleus

• Sum of the protons and neutrons in the

  nucleus

• Sum of the protons, neutrons and electrons

What do the initial moments after the Big Bang have in common with the universe as it exists now? 

• all the stars, galaxies, and planets that exist today were formed just a few moments after the Big Bang
• The universe back then could not sustain life, and it cannot sustain life now
• the universe was extremely hot then, and it is still extremely hot not
• the universe began expanding then, and it is still expanding today