The mass of an electron and its antiparticle, a positron, is 0.511 MeV/c2 . In order to produce an electron-positron pair, a gamma ray must have an energy larger than 1.022 MeV because __________
Fill in the blank(s) with correct word
of the equivalence of mass and energy
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An aluminum cantilever beam (E 5 72 GPa) with a square cross section and span length L 5 2.5 m is sub- jected to uniform load q 5 1.5 kN/m. The allowable bending stress is 55 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 20 mm
(C) 30 mm
(D) 40 mm
A 400-g piece of metal at 100°C is dropped into a 100-g aluminum cup containing 500 g of water at 15°C. The final temperature of the system is 40°C
What is the specific heat of the metal, assuming no heat is exchanged with the surroundings? The specific heat of aluminum is 900 J/(kg?K) A) 1900 J/(kg?K) B) 2270 J/(kg?K) C) 3300 J/(kg?K) D) 3800 J/(kg?K) E) 4280 J/(kg?K)
Light pollution makes it impossible to see faint objects
Indicate whether the statement is true or false
Which of the following statements is not true about x-ray scattering (in crystals) and its importance?