When ImageRa decays by emitting an alpha particle, what is the atomic number of the resulting nucleus? What is the resulting atomic mass?
A) atomic number = 86; atomic mass = 222
B) atomic number = 87; atomic mass = 226
C) atomic number = 86; atomic mass = 224
D) atomic number = 87; atomic mass = 224
Answer: A
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Imagine that we have two isolated metal spheres. The one on the left has a negative charge, while the one on the right has a positive charge. If these spheres are connected with a straight metal wire, what direction does the conventional current flow?
A. Left to right B. Right to left C. Because there is no electric field, no current flows. D. The direction depends on the spheres’ relative sizes.
Assume that an ohmic light bulb’s brightness is directly proportional to the power it dissipates. If we replace the battery in our simple circuit with one with twice the characteristic potential difference, the bulb’s brightness
A. remains the same. B. increases by a factor of 2. C. increases by a factor of 4.
Why did Hubble conclude the universe must be expanding?
What will be an ideal response?
What is the origin of synchrotron radiation in radio galaxies?
A. neutron stars at the center of the radio galaxy B. supernova explosions C. radiation from a massive black hole at the center of the galaxy D. high-speed electrons spiraling around the magnetic field lines E. hydrogen gas