Since the Helium molecule (He) is 2 times as massive as the Hydrogen molecule (H2), the speed of sound in Hydrogen is ________ the speed in Helium
A) 1.41 times
B) two times
C) four times
D) eight times
E) 1/ times
A
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Determine the magnitude of the Burger’s vector in MgO, shown in Figure 3.10, that has the NaCl crystal structure with a lattice parameter of 0.4212 nm, and compare the magnitude of this Burger’s vector to that of copper. Note that the Burger’s vector is in the [110] direction in MgO.
What will be an ideal response?
Three identical very small 50-kg masses are held at the corners of an equilateral triangle, 0.30 m on each side
If one of the masses is released, what is its initial acceleration if the only forces acting on it are the gravitational forces due to the other two masses? (G = 6.67 × 10-11 N ? m2/kg2) A) 1.9 × 10-8 m/s2 B) 4.2 × 10-8 m/s2 C) 6.4 × 10-8 m/s2 D) 2.5 × 10-8 m/s2 E) 3.7 × 10-8 m/s2
What electric charge is characteristic for an ion of Cl?
a. 7+ b. 0 c. 1– d. 1+
If an object feels cold to the touch, the only statement that you can make that must be correct is that
a. the object has a smaller coefficient of thermal conductivity than your hand. b. the volume of the object will increase while it is in contact with your hand. c. the object contains less thermal energy than your hand. d. the object is at a lower temperature than your hand. e. the object cannot be a liquid.