If an atom has 104 electrons, 157 neutrons, and 104 protons, what is its approximate atomic mass?
A) The approximate atomic mass is 365.
B) The approximate atomic mass is 261.
C) The approximate atomic mass is 157.
D) The approximate atomic mass is cannot be determined with the information given.
Answer: B
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A) birds that were able to survive the impact that wiped out the dinosaurs 65 million years ago B) sea animals that colonized the land after the impact that wiped out the dinosaurs 65 million years ago C) early mammals that lived under the ground that were able to survive the impact that helped to wipe out the dinosaurs 65 million years ago D) early mammals that killed off the dinosaurs
Find the frequencies of the first three harmonics of a 1.0-m long string which has a mass per unit length of 2.0 × 10^-3 kg/m and a tension of 80 N when both ends are fixed in place
In a Compton scattering experiment, the scattered photon has a wavelength of 6.55 pm. If the scattering angle is 
what is the energy of the incident photon?
A. 1.43 MeV B. 218 keV C. 380 keV D. 117 keV E. 66.3 keV
The first hint of the role of asteroids in extinction of the dinosaurs came from:
A) finding the huge crater in the Yucatan. B) finding dinosaur fossils with meteorites imbedded in them. C) finding a layer of worldwide iridium enriched dust. D) finding that dinosaurs were warm-blooded and smart. E) finding that no volcanic eruptions were linked to their disappearance.