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Question: An electric discharge causes atomic hydrogen to emit photons with energies of 1.89, 2.55, and 2.86eV. In an experiment these are passed through a 1mm wide slit and then through a diffraction grating that has 5000 rulings per centimeter. The photons then go on and strike a screen 1m away.
a. What are the wavelengths of these photons?
b. Describe what appears on the screen and where. Be quantitative. Also give colors and tell how you know them.
c. Explain why these results suggest that light is a wave?
A camera with interchangeable lenses is used to photograph a distant object. The angular size of the object is 27 degrees. What is the longest focal length lens
Suppose that in the same Atwood setup another string is attached to the bottom of m1 and a constant force f is applied, retarding the upward motion of m1. If m1 = 4.80 kg and m2 = 9.60 kg, what value of f will reduce the acceleration of the system..
A system has a heat source supplying heat at a rate of 149 W and is doing work at a rate of 104.3 W. At what rate is the internal energy of the system changing
Translational equilibrium occurs when an object moves with constant velocity or is at rest resulting in an acceleration of magnitude equal to zero. Which law(s) governs this relationship
A spring with stiffness 125 N/m and relaxed length 0.50 m hangs vertically from the ceiling. what is the maximum stretch of the spring
A well-engineered ski jump is less dangerous than it looks because skiers hit the ground with very small velocity components perpendicular to the ground. What is the slope of the ground in the landing zone
A series ac circuit contains a 250? resistor, a 20.0mH inductor, a 3.50?F capacitor, Find the average power delivered to the entire circuit
The platter of the hard drive of a computer rotates at 7100 rpm = revolutions per minute = rev/min). Find the angular velocity of the platter
a virtual image is located 53.5cm behind a concave mirror with focal length 20.0cm .a. where is the distance from the
A window air conditioner unit absorbs 9.85 104 J of heat per minute from the room being cooled and in the same time period deposits 1.47 105 J of heat into the outside air. What is the energy efficiency rating of the unit
UVB photons have a wavelenghth of 300nm. what is the frequency of UBV photons, What is the energy of a UBV photon in JOULES
you are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the empire state
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