A telescope is used to view two small lights separated by 2.0 cm at a distance of 500 m. What minimum objective lens diameter is needed to just resolve these objects if their wavelength is 656 nm?
a. 2.0 cm b. 1.0 cm
c. 1.2 cm d. 2.4 cm
a
You might also like to view...
We say that energy cannot be created nor destroyed, yet a heat pump usually delivers more energy (heat) into the house than it receives from the power source (electricity, gas, etc). Why is this not a violation of the law of conservation of energy?
What will be an ideal response?
As a spaceship heads directly to Earth at a velocity of 0.8c, it sends a radio signal to Earth. When those radio waves arrive on Earth, their velocity relative to Earth is
A.
B.
C.
D.
, where vE is the velocity of the Earth.E.
, where vE is the velocity of the Earth.Which force field can both accelerate an electron and change its speed?
A) electric field. B) magnetic field. C) both of these D) none of the above
How many radioactive atoms are present in a sample that has an activity of 0.5 ?Ci and a half-life of 10 years? (1 curie = 3.7 × 10^10 decays/s)
a. 9.5 × 10^12 atoms b. 8.4 × 10^12 atoms c. 7.3 × 10^12 atoms d. 6.5 × 10^12 atoms e. 2.7 × 10^5 atoms