What is the angular radius θ1 of the first dark ring for a point source being imaged by this telescope? use 550 nanometers for the wavelength

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Aballet student who learns with the of his instructor is demonstrating learning.

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants