Light Energy
Physics · 50 practice questions
Natural and artificial sources of light; luminous and non-luminous objects; propagation of light (speed, frequency, wavelength); formation of shadows and eclipses; the pinhole camera.
- Compare natural and artificial sources of light and differentiate luminous from non-luminous objects.
- Relate the speed, frequency and wavelength of light.
- Interpret the formation of shadows and eclipses, and solve problems on the pinhole camera.
Try a few questions
- Practice question 1
The moon's phases, as seen from earth, result from the changing relative positions of the earth, moon, and sun, which determine
- A.how much of the moon's sunlit side is visible to us
- B.how much light the moon itself actually produces
- C.the moon's actual physical shape at different times of the month
- D.the moon's distance from the earth at different times of the month
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A. how much of the moon's sunlit side is visible to us
As the moon orbits the earth, the visible fraction of its sunlit hemisphere changes, producing the familiar cycle of lunar phases.
- Practice question 2
The speed of light in a vacuum, approximately 3 x 10⁸ m/s, is
- A.slower than the speed of sound in most solid materials
- B.variable, changing significantly depending on the observer's own motion
- C.identical to the speed of sound in a vacuum
- D.the fastest speed at which any form of energy or information can travel
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D. the fastest speed at which any form of energy or information can travel
According to modern physics, this speed represents an absolute upper limit for the transfer of energy or information.
- Practice question 3
A shadow with sharp, well-defined edges typically forms when the light source is
- A.small (e.g. a point source) relative to the object casting the shadow
- B.very large relative to the object casting the shadow
- C.positioned extremely far from the object, regardless of its size
- D.positioned extremely close to the object, regardless of its size
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A. small (e.g. a point source) relative to the object casting the shadow
A small, point-like source produces a shadow with a clean, well-defined edge, unlike a larger, extended source.
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