Why can a 25. watt fluorescent lamp produce as much illumination as a 100. watt incandescent lamp?
What will be an ideal response?
The incandescent lamp produces heat out of the majority of the input energy and only a minority fraction becomes light. The fluorescent lamp produces more light, less heat.
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Ashen light (or earthshine) is
A) sunlight reflected by Earth that illuminates the "dark" portion of the Moon. B) the sunlight that shines on the face of the Moon that we never see. C) the light from the Moon that illuminates Earth's surface at night. D) the light we see at dawn just before the Sun rises. E) the light we see at dusk just after the Sun sets.
Imagine you are holding a long rope under tension attached to a distant support. You can generate periodic waves by shaking the end up and down. Changing which of the following will least affect the velocity of waves along the string?
A. Tension B. Frequency C. Mass per unit length of rope D. None of these choices affect the wave speed
According to the period-luminosity relation, the long-period Cepheids are more luminous than the short-period Cepheids
Indicate whether the statement is true or false
How has the chemical composition of the core of the Sun changed in the past 4.5 billion years? Are earthlings (if any) likely to freeze in another 4-5 billion years? Explain
What will be an ideal response?