When an unstable U nucleus undergoes alpha decay, the nucleus formed is that of
a. Uranium.
b. Plutonium.
c. Protactinium.
d. Thorium.
e. Neptunium.
d
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A parallel light beam containing two wavelengths, 480. nm and 700. nm, strikes a plain piece of glass at an angle of incidence of 60°. The index of refraction of the glass is 1.4830 at 480. nm and 1.4760 at 700. nm
Determine the angle between the two beams in the glass.
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.
The luminosity of a star allows astronomers to determine the radius and distance of the star.
Answer the following statement true (T) or false (F)
The temperature of 100 g of water is to be raised from 10°C to 90°C. The energy needed to do this is about
A. 5 × 103 cal. B. 6 × 103 cal. C. 8 × 103 cal. D. 5.4 × 104 cal. E. 1 × 103 cal.