The primary mirror in an astronomical telescope must be a
a. half-silvered mirror.
b. convex mirror.
c. concave mirror.
d. plane mirror.
c
You might also like to view...
Most supermassive black holes are dormant
a. True b. False Indicate whether the statement is true or false
A radioactive nuclide of atomic number Z emits an electron, then the daughter nuclide emits a gamma ray. What is the atomic number of the resulting nuclide after both processes?
A) Z - 1 B) Z + 2 C) Z - 3 D) Z + 1 E) Z - 2
What is the beat frequency produced when two sound waves differ by two hertz?
a. Two per minute. b. One-half hertz. c. Two hertz. d. One hertz. e. Ten hertz.
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The potential energy of the crate is __________
Fill in the blank(s) with correct word