The energy level diagram for hydrogen
The ionization energy of hydrogen is
a.
1.5 eV.
b.
1.9 eV.
c.
3.4 eV.
d.
10.2 eV.
e.
13.6 eV.
e
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The Sun fuses _____ hydrogen nuclei to make one helium nucleus
A) two B) three C) four D) five
An 800-kHz radio signal is detected at a point 9.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.23 V/m
Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the average electromagnetic energy density at that point? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2 ) A) 2.3 × 10-13 J/m3 B) 9.4 × 10-13 J/m3 C) 4.7 × 10-13 J/m3 D) 3.3 × 10-13 J/m3 E) 6.6 × 10-13 J/m3
Experimenting is part of the scientific method
Indicate whether the statement is true or false
A copper and an aluminum part are bolted together as shown. Estimate the rate of diffusion of copper into the aluminum if the copper mass fraction is 0.1% at 2 mm into the aluminum at a particular time, and the diffusivity is the same as that at 500ºC.
