A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. S1 and S2 are in phase. 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 waves shown
arriving at P2 both arrive with amplitude A, the resultant amplitude at point P2 is
a.
0.
b.
.
c.
A.
d.
a
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Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C As the ice is melting, the temperature of the ice-water mixture rises by
a. 0°C b. +5°C c. –5°C d. +10°C e. –10°C
Quasars and other active galactic nuclei are often intense sources of x-rays. According to the supermassive black hole hypothesis, where are these x-rays produced?
A) in hot gas in an accretion disk around the central black hole B) in ionization nebulae heated by supernovae near the black hole C) in dust-rich molecular clouds that are forming new stars near the black hole D) in the central black hole itself
The dense disks of gas and dust such as those seen around the stars in Orion are sites where planets could be forming right now
a. True b. False Indicate whether the statement is true or false
Underground mines produce smaller amounts of coal per year than strip mines by their very nature
What will be an ideal response?