At what rate are photons emitted by a 50.0-W sodium vapor lamp if it is producing monochromatic light of wavelength 589 nm?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
1.48 × 1020 photons per second
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A person having a near point of 25 cm and a far point at infinity uses a converging lens of focal length 5.0 cm as a magnifying glass. What is the magnification if the person's eye is relaxed (with the image at his far point)?
What will be an ideal response?
The speed of water in a stream is affected by
A) hydraulic gradient, recharge, and channel geometry. B) gradient, discharge, and channel geometry. C) high gradient, laminar flow, and erosion. D) gradient, turbulence, and friction.
The fact that some satellites and planets have cratered surfaces supports the hypothesis that planets and satellites were bombarded by planetesimals.
Answer the following statement true (T) or false (F)
As you walk away from a vertical plane mirror, your image in the mirror
A) is always the same height. B) may or may not decrease in height, depending on where the observer is positioned. C) is always a real image, no matter how far you are from the mirror. D) changes from being a virtual image to a real image as you pass the focal point. E) decreases in height.