An alpha particle is:
a. any positively charged nucleus.
c. a neutral helium atom.
b. an X-ray.
d. None of these choices.
D
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A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is 6.0 cm from the axis
One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. An electromagnetic wave with an intensity of 0.30 kW/m2 is incident normally upon the vanes. What is the radiation pressure on the blackened vane? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 1.0 × 10-10 Pa B) 1.0 × 10-9 Pa C) 1.0 × 10-8 Pa D) 1.0 × 10-7 Pa E) 1.0 × 10-6 Pa
A Type II supernova can form a _______________ or a black hole
a. neutron star b. red giant c. white dwarf d. planet
A 4000-? resistor is connected across a 220-V power source. What current will flow through the resistor?
A) 0.055 A B) 1.8 A C) 5.5 A D) 18 A
The boundary shown is that of a uniform magnetic field directed in the positive z direction. An electron enters the magnetic field with a velocity pointing along the x axis and exits 0.63 ?s later at point A. What is the magnitude of the magnetic field?
a.
18 ?T
b.
14 ?T
c.
28 ?T
d.
34 ?T
e.
227 ?T