A researcher is investigating a cubic crystal with x rays. He is looking at Bragg reflection from the planes parallel to the cube faces
He finds that when using x rays of 0.165 nm a strong first maximum occurs when the beam makes an angle of 23.5° with the planes. What is the spacing of adjacent atoms in the crystal?
0.207 nm
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The block shown in the figure has mass =7.0 kg and lies on a fixed smooth frictionless plane tilted at an angle theta=22.0 degrees to the horizontal.
(a) Determine the acceleration of the block as it slides down the plane.
(b) If the block starts from rest 12.0 m up the plane from its base, what will be the block’s speed when it reaches the bottom of the incline?
A thermos bottle works well because:
A. its glass walls are thin B. silvering reduces convection C. vacuum reduces heat radiation D. silver coating is a poor heat conductor E. none of the above
A photovoltaic cell receives energy input primarily by
A) conduction. B) convection. C) radiation. D) all of the above
A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is
A) greater than the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero.