How do interference and diffraction differ? How are they similar?
What will be an ideal response?
Interference is the addition of a finite number (usually small number) of coherent waves whereas diffraction involves an infinite (uncountably large) number of waves.
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Factors that increase ocean salinity are
A) runoff from streams and rivers. B) formation of sea ice. C) precipitation. D) glacial melting.
The internal structure of the Earth is investigated mainly by
A) studying seismic waves generated from earthquakes B) deep drilling C) remote sensing satellites D) measuring changes in the Earth's magnetic field
A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one half and one and a half wavelengths distant from their respective sources. If the phase at S1 and S2 is zero at this
instant, and the waves shown arriving at P1 both arrive with amplitude A, the magnitude of the phase angle of each wave at point P1 (in radians) is
a.
0.
b.
?.
c.
2?.
d.
3?.
e.
?/2.
Spherical Mirrors: An object is placed 50 cm in front of a concave mirror with a focal length of 25 cm. What is the magnification produced by the mirror?
A. -0.50 B. -1.0 C. +1.5 D. -2.0 E. +1.0