A telescope design that uses a lens and no mirrors is a refractor
Indicate whether the statement is true or false
TRUE
You might also like to view...
A steel pipe (E 5 190 GPa, ? 5 14 3 1026/°C, d2 5 82 mm) of length L 5 4.25 m hangs from a rigid surface and is subjected to a temperature increase ?T 5 50 °C. The column is fixed at the top and has a small gap at the bottom. To avoid buckling, the minimum clearance at the bottom should be approximately:
(A) 2.55 mm
(B) 3.24 mm
(C) 4.17 mm
(D) 5.23 mm
There is a temperature at which the reading on the Kelvin scale is numerically:
A. equal to that on the Celsius scale B. lower than that on the Celsius scale C. equal to that on the Fahrenheit scale D. less than zero E. none of the above
A charge of 40 pC is distributed on an isolated spherical conductor that has a 4.0-cm radius. Point A is 1.0 cm from the center of the conductor and point B is 5.0 cm from the center of the conductor. Determine the electric potential difference VA - VB
a. +1.8 V b. +29 V c. +27 V d. +7.2 V e. +9.0 V
An extraterrestrial observer would pick up the strongest radio signals when:
A) the Earth was at perihelion. B) North America was either rising or setting for the observer. C) North America was directly in front of the observers. D) at new or full Moon. E) Saturday Night Live is on.