Fundamental Facts in Physics (Module 7 and 8)

Heisenberg uncertainty principle describes th limit to which some quantitis canbe measured

• true

• false

on an atomic level, energy and matter exhibit the characteristics of both waves and particles

• true

• false

de Broglie viewed electrons as particles

• true

• false

de Broglie suggested that the only way an electron could maintain a steady energy level was if it estabilished a standing wave

• true

• false

the electron diffraction experiment provides an example of the application of the uncertainty principle

• true

• false

in the ​ (a)   mechanical model, ​ (b)   are not particles and ​ (c)   have clearly defined orbits

• quantum
• electrons
• do not
• atomic
• nucleons
• do

the wavelength of a particle is given by

radioactive nuclei are unstable as a result of

• the strong nuclear force

• the imbalance between the electrostatic and the strong nuclear forces in the nucleus

• too many protons

• the balance between the forces within the nucleus

Reorder the following in increasing penetrative power

• beta particles

• gamma rays

• alpha particles

Reorder the following in terms of their increasing speed

• alpha

• beta

• gamma