Evaluate the energy of the blackbody photons inside your eye. compare this with the visible energy inside your eye while looking at a 100-w light bulb that is 1 m away. you can assume that the light bulb is 100% efficient, although in reality it converts only a few percent of its 100 watts into visible photons. take your eye to be a hollow sphere of radius 1.5 cm at a temperature of 37◦c. the area of the eye’s pupil is about 0.1 cm2. why is it dark when you close your eyes?

Which type of microscope would allow the viewer to see ribosomes inside a cell?

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.

The flow of electrons from one atom to another is called