A concave mirror with a radius of curvature of 1.0 m is illuminated by a candle located on the symmetry axis 3.0 m from the mirror. Where is the image of the candle?
What will be an ideal response?
60 cm in front of the mirror
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According to the Stefan–Boltzmann law, an object at room temperature that is sitting in a room (also at room temperature) must emit electromagnetic radiation. Since it is losing energy by emitting this radiation, why does its temperature remain constant?
A. It receives heat by conduction from the air and from what it is sitting on. B. It receives heat by convection from the air. C. It receives heat by radiation from objects in the room. D. All of the above. E. Its temperature actually does decrease. F. It does not actually emit any radiation. T. Some other explanation (specify)
You hit a tennis ball over the net. When the ball reaches its maximum height, its speed is
A) equal to its initial speed. B) less than its initial speed. C) greater than its initial speed. D) zero. E) g?t.
A gravitational lens occurs when
A) a massive object causes more distant objects to appear much larger than they should, and we can observe the distant objects with better resolution. B) a telescope lens is distorted by gravity. C) a massive object bends light beams that are passing nearby. D) dark matter builds up in a particular region of space, leading to a very dense region and an extremely high mass-to-light ratio.
A pure sample of 226Ra contains 2.3 × 10^13 atoms of the isotope. If the half-life of 226Ra = 1.6 × 10^3 years, what is the activity of this sample?
a. 1.4E+10 decays/yr b. 1.0E+10 decays/yr c. 3.2E+2 decays/yr d. 3.7E+16 decays/yr e. 6.2E+6 decays/yr