If a nucleus decays by alpha decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)
A) The daughter nucleus has more neutrons than the original nucleus.
B) The daughter nucleus has more protons than the original nucleus.
C) The daughter nucleus has fewer protons than the original nucleus.
D) The daughter nucleus has the same number of nucleons as the original nucleus.
E) The daughter nucleus has fewer neutrons than the original nucleus.
C, E
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Under steady state conditions, a piece of wood 350 mm by 350 mm and 15 mm thick conducts heat through its thickness and loses no appreciable heat through its well-insulated sides
The rate of heat flow is measured to be 14.0 W when the temperature difference across its thickness is 28°C. Determine the thermal conductivity of this wood. A) 9.2 × 10-4 W/(m ? °C) B) 270 W/(m ? °C) C) 16 W/(m ? °C) D) 0.061 W/(m ? °C) E) 33 W/(m ? °C)
What should be the height of a dipole antenna (of dimensions 1/4 wavelength) if it is to transmit 1 200 kHz radiowaves?
a. 11.4 m b. 60 cm c. 1.12 m d. 62.5 m e. 250 m
Torque: A flat circular loop of wire of radius 0.50 m that is carrying a 2.0-A current is in a uniform magnetic field of 0.30 T. What is the magnitude of the magnetic torque on the loop when the plane of its area is perpendicular to the magnetic field?
A. 0.00 N ? m B. 0.41 N ? m C. 0.47 N ? m D. 0.52 N ? m E. 0.58 N ? m
Estimation: Estimate the thickness, in meters, of an ordinary sheet of paper.
A. 10-4 m B. 10-5 m C. 10-6 m D. 10-7 m E. 10-8 m