A photocathode having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 3.4 eV. What is maximum kinetic energy of the photoelectrons produced?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 1.6 × 10-19 J
B) 3.8 × 10-19 J
C) 4.4 × 10-19 J
D) 4.9 × 10-19 J
E) 5.4 × 10-19 J
A
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How much heat energy is needed to change 10 kg of water at 50°C to steam at 120°C?
A) 4.2 × 105 J B) 2.3 × 107 J C) 4.2 × 106 J D) 3.6 × 106 J E) 2.5 × 107 J
A 50-K dense cloud is a blackbody
a. True b. False Indicate whether the statement is true or false
Charge of uniform density (0.30 nC/m2) is distributed over the xy plane, and charge of uniform density (–0.40 nC/m2) is distributed over the yz plane. What is the magnitude of the resulting electric field at any point not in either of the two charged planes?
a. 40 N/C b. 34 N/C c. 28 N/C d. 46 N/C e. 6.0 N/C
A charged particle (mass = 4.0 ?g, charge = 5.0 ?C) moves in a region where the only force on it is magnetic. What is the magnitude of the acceleration of the particle at a point where the speed of the particle is 5.0 km/s, the magnitude of the magnetic field is 8.0 mT, and the angle between the direction of the magnetic field and the velocity of the particle is 60°?
A. 39 km/s2 B. 43 km/s2 C. 48 km/s2 D. 52 km/s2 E. 25 km/s2