A change in the direction of a wave when the wave finds an obstacle or an edge.
a) Refraction
b) Standing wave
c) Reflection
d) Diffraction
Ans: d) Diffraction
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The finding that electrons occupy discrete orbits in an atom was first explained by the
A) quantization of electric charge. B) small mass of the electron. C) circumference of each orbit being an integral multiple of an electron wavelength. D) none of the above
The 105°W longitude meridian is the center of the ______________ Standard Time zone in the United States
a. Pacific b. Mountain c. Eastern d. Central
The ratio of the density of a neutron (r = r0A1/3) to the density of a classical electron (re = ke2/mec2 = 2.8 × 10^-15 m) is
a. 4.3 × 10^2 b. 2.3 × 10^4 c. 1.4 × 10^2 d. 6.9 × 10^-3 e. 4.3 × 10^3
What is the difference between a mineral and an element?
What will be an ideal response?