Matter Waves: A certain crystal has a spacing of 0.442 nm between atoms. A beam of neutrons moving with a speed of 1640 m/s perpendicular to the surface is diffracted as it passes through the crystal. What is the angle from the central maximum to the next interference maximum? (mneutron = 1.675 × 10-27 kg, h = 6.626 × 10-34 J ? s)
A. 17.0°
B. 21.0°
C. 33.1°
D. 60.0°
E. 90.0°
Answer: C
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A current-carrying ohmic metal wire has a cross-sectional area that gradually becomes smaller from one end of the wire to the other. The current has the same value for each section of the wire, so charge does not accumulate at any one point. How does the drift speed vary along the wire as the area becomes smaller?
1.It increases. 2.It decreases. 3.It remains constant.
A heavy stone of mass m is hung from the ceiling by a thin 8.25-g wire that is 65.0 cm long. When you gently pluck the upper end of the wire, a pulse travels down the wire and returns 7.84 ms later, having reflected off the lower end
The stone is heavy enough to prevent the lower end of the wire from moving. What is the mass m of the stone? A) 8.90 kg B) 23.1 kg C) 35.6 kg D) 227 kg E) 349 kg
In a thunderstorm cloud, the concentration of negative charge is in the __________ portion of the cloud
Fill in the blank(s) with correct word
Spherical Mirrors: A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?
A. 20 cm B. 15 cm C. 7.5 cm D. 5.0 cm