Which of the following statements about electrons is not true?
A) They are composed of quarks.
B) In an atom, an electron can have two possible values for its spin, usually called spin up and spin down.
C) Electrons are one of the six known types of lepton.
D) Electrons can behave both as particles and as waves.
A) They are composed of quarks.
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Which of these will always produce a magnetic field?
A. Another magnetic field B. A moving charge C. A negative charge at rest D. A positive charge at rest
A mirror with a focal length 100 cm has a 4.0 cm object placed 20 cm in front of it. What is the position of the image?
A) 25 cm behind the mirror B) 100 cm in front of the mirror C) 20 cm in front of the mirror D) 20 cm behind the mirror E) 25 cm in front of the mirror
A 1000-kg car experiences a net force of 9500 N while slowing down from 30 m/s to 15.9m/s How far does it travel while slowing down?
A) 31 m B) 34 m C) 41 m D) 37 m
The radioactive isotope 7Be (atomic number 4 ) decays to the isotope 7Li (atomic number 3). What type of radioactive decay is this?
A) electron capture B) beta decay C) electron ionization D) alpha decay