Light-gathering power is proportional to the _______________ of the telescope primary lens or mirror

Fill in the blank(s) with correct word


area

Physics & Space Science

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Dimensional Analysis: The distance d through which a beam of length L is deflected when it is subjected to a fixed load may be described by the relationship d = RL2. What are the SI units of the constant R?

A. m3 B. m2 C. m D. m-1 E. R is dimensionless

Physics & Space Science

What is the result of the Greenhouse effect on the surface environment of Venus?

A) It has little or no effect. B) Its effect is about the same as on Earth. C) It has reduced the surface temperature by about 30 degrees Celsius. D) It has raised the surface temperature by hundreds of degrees Celsius. E) It causes the surface temperature of Venus to become hotter than the Sun.

Physics & Space Science

Thomas Young's two-source interference patterns demonstrate the

A) particle nature of light. B) wave nature of light. C) both of these D) neither of these

Physics & Space Science

In a fusion reactor, the high temperature of the order of 108 K is required in order that what condition is met?

a. melt down the hydrogen fuel b. strip the hydrogen atoms of their electrons c. break the protons into their elementary particle sub-parts d. overcome Coulomb repelling forces between protons

Physics & Space Science