The spacing between atoms in KCl crystal is 3.1 × 10^?10 m. At what angle from the surface will a beam of 2.23 × 10^?11-m x-rays be constructively scattered?
a. 30°
b. 2.1°
c. 0.11°
d. 20°
e. 64°
b
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A level pipe contains a nonviscous, incompressible fluid with a density 1200 kg/m3 that is flowing steadily. At one position within the pipe, the pressure is 300 kPa and the speed of the flow is 20.0 m/s
At another position, the pressure is 200 kPa. What is the speed of the flow at this second position? A) 567 m/s B) 16.2 m/s C) 32.9 m/s D) 23.8 m/s E) 186 m/s
A parallel-plate capacitor has a capacitance of 10 mF and charged with a 20-V power supply
The power supply is then removed and a dielectric material of dielectric constant 4.0 is used to fill the space between the plates. How much energy is now stored by the capacitor? A) 500 mJ B) 1200 mJ C) 125 mJ D) 62.5 mJ E) 250 mJ
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(a) How much charge has passed through this wire? (b) How many electrons have passed any point in the wire? What will be an ideal response?
The magnitude of the total negative charge on the electrons in 1 mol of helium (atomic number 2, atomic mass 4) is:
A) 4.8 × 104 C B) 9.6 × 104 C C) 1.9 × 105 C D) 3.8 × 105 C E) 7.7 × 105 C