The centers of stars are many millions of degrees cooler than their surfaces
Indicate whether the statement is true or false
False
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The intensity of solar radiation near the earth is 1.4 kW/m2. What force is exerted by solar radiation impinging normally on a 5.0 m2 perfectly reflecting panel of an artificial satellite orbiting the earth?
(c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 14 kN B) 94 µN C) 140 µN D) 23 µN E) 47 µN
During a reaction, an element loses 4.8 × 10-28 kg of mass. How much energy (in Joules) is released?
A) 4.3 × 10-11 J B) 1.4 × 10-19 J C) 1.6 × 10-36 J D) 2.1 × 10-40 J E) 5.3 × 10-45 J
A photocathode whose work function is 2.5 eV is illuminated with white light that has a continuous wavelength band from 360 nm to 700 nm. The stopping potential for this white light illumination is closest to:
A) 0.94 V B) 0.85 V C) 1.0 V D) 1.1 V E) 1.2 V
A circular ring of charge with radius b has total charge q uniformly distributed around it. What is the magnitude of the electric field at the center of the ring?
1. 0 2. keq/b2 3. keq2/b2 4. keq2/b 5. none of those answers