Coherent light of wavelength 575 nm falls on a double-slit and the third-order bright fringe is seen at an angle of 6.5° away from the centerline. How far apart are the double slits?
A) 15 ?m B) 10 ?m C) 20 ?m D) 5.0 ?m
A
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A cylindrical tank (height h, radius r) is full to the brim of water and its top is open to the outside air. What expression describes the speed of fluid flowing out of a hole that is opened up at height h’ above the bottom of the tank?
a. 
b. 
c. 
d. 
The atoms that make up a newborn baby were made
1) in the mother's womb, 2) from the food that the mother ate, 3) in the ancient stars, While all atoms heavier than copper were manufactured by processes 4) photosynthesis. 5) atomic fabrication. 6) supernova explosions. 7) radioactivity. 8) none of these.
Polarization is a property of
A) transverse waves. B) longitudinal waves. C) both of these D) neither of these
If an object remains at rest, then the sum of both the external torques and the external forces on the object must be zero
A) True B) False