Which element is the last to be produced by fusion in the cores of the most massive stars (just before their lives end in supernova explosions)?
A) iron
B) lead
C) oxygen
D) uranium
E) hydrogen
A) iron
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Which of the following scenarios correctly demonstrates the transformation of mass into energy as given by Einstein's equation, E = mc2?
A) When hydrogen is fused into helium, whether in the Sun or in a nuclear bomb, the mass difference is turned into energy. B) An object accelerated to a great speed has a lot of kinetic energy. C) A mass raised to a great height has a lot of gravitational potential energy. D) When you boil a pot of water, it has a high heat content, or thermal energy. E) A burning piece of wood produces light and heat, therefore giving off radiative and thermal energy.
What is the f-number of a camera lens that has an aperture-opening diameter of 0.30 cm and a focal length of 6.0 cm?
a. 0.30 b. 1.8 c. 20 d. 6.0 e. 0.05
You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must have been equal
A) True B) False
If the wavelength of a photon in vacuum is the same as the de Broglie wavelength of an electron, which one is traveling faster through space?
A) The electron because it has more mass. B) The photon because photons always travel through space faster than electrons. C) They both have the same speed.