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A sample of potassium metal (in vacuum) is illuminated by a light source as shown above. The photoelectrons (i.e. electrons emitted from the potassium when exposed to light) are collected on plate P, and the electron current is measured by meter G. The work function of potassium is 2.0 eV,
A) Initially red light (700 nm) is shown on metal, but the wavelength of the light is slowly decreased. At what wavelength should a person first read a current on the meter?
B) As the wavelength is decreased until the light is violet (400 nm) will the current continue to increase? Assume that the intensity of the light stays constant as you decrease its wavelength.
C) Find the kinetic energy and speed of the electrons emitted when the light source is at 400 nm.
You are driving 110 miles to Columbus from Cincinnati. The first 100 miles you drive a good speed of 75mi/h . Unfortunately, you hit a traffic jam the last 10 miles where at least you move a constant 8.00mi/h .
The drill pipe has an outer diameter of 75 mm, a wall thickness of 6 mm, and a weight of 0.8 kN/m. If it is subjected to a torque and axial load as shown.
Two point charges are located as shown in the figure, with charge q1 = +3.5 C at x = ?3.0 m, y = 0, How much work must be done on the electron to move it to the origin
An opening of area 0.264 cm2 in an otherwise closed beverage keg is 48.4 cm below the level of the liquid (of density1.05 g/cm3) in the keg. Find the speed of the liquid flowing through the opening
A biologist is studying the growth of rats in an orbiting space station. To determine a rat's mass, she puts it in a 330g cage, what is the rat's mass
Sam heaves a shot with weight 16-lb straight upward, giving it a constant upward acceleration from rest of 45.5m/s2 for a height 63.0cm, What is the speed of the shot when he releases it
Two large metal plates of area 0.5 m2 face each other. They are 4.8 cm apart and have equal but opposite charges on their inner surfaces. what is the magnitude of the charge on each plate
A piano has approximately 1000 Newton's (225 lbs) of tension in each string. What is the total force inside of a piano in pounds
A bird watcher meanders through the woods, walking 1.78 km due east, 1.03 km due south, obtain the magnitudes of the bird watchers displacement
A puck goes around its circular path once every 1.6 second. Its speed is 33 cm/s. Evaluate what is the radius of its circular path
A round object has a rotational inertia of I = ?MR2, where ? is a constant, M is its mass and R is its radius. What fraction of the total kinetic energy is rotational
A brick is initially 12.10 cm high and an aluminum can is initially 12.11 cm high. By how much should their temperatures be raised in order for the brick and the can to have exactly the similar height?
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