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A hydrogen atom emits a photon having an energy of 12.1 eV.
a. What's the frequency of the photon?
b. Using the fact that the ionization energy of the H-atom in its ground state is 13.6 eV, determine the principal quantum number "n" of the initial state, given that for the final state, "n" = 1.
Two cars start from rest at a red stop light, When the light turns green, both cars accelerate forward, finally catching the blue car just as the blue car comes to a stop, How fast is the blue car going 9 seconds after it starts
Threshold freq. of metal isf0. When the light of freq. 2f0 is incident on the metal max velocity of electrons is v1 and v2
Two unequal masses are hung from the ends of a rope that runs over a pulley. What is the acceleration of the smaller mass
The springs of a 1100 kg car compress 4.5 mm when its 68 kg driver gets into the driver's seat. what will be the frequency of vibrations
The owner of a van installs a rear-window lens that has a focal length of -0.300 m. How far from the van is the object actually located
An observer moving toward Earth with a speed of 0.96 notices that it takes 5.2 for a person to fill her car with gas. Assume, in its place, that the observer had been moving away from Earth with a speed of 0.80.
A concave makeup mirror is designed so that a person 26 cm in front of it sees an upright image magnified by a factor of two
A certain single ion channel is selectively permeable to K and has a resistance of 1.15 GOhms. How many K ions travel through the channel during this time
A jeweler working awith a heated 47 g gold ring must lower the ring's temperature to make it safe to handle. If the ring is initially at 99 C, what mass of water at 25 C is needed to lower the rings temperature to 38 c.
A person lifts a 5kg cement block a vertical distance of 2.3m and after that aeries the block horizontally a distance of 6m. Determine the work completed by the person and by the force of gravity in this process.
A ball of weight 1.5 N is thrown at an angle of 30° above the horizontal with an initial speed of 12 m/s. the net force (ignoring air resistance) on the ball is:
The radius of the aorta is about 1.4cm , and the blood passing through it has a speed of about 40cm/s. Calculate the average speed of blood flow in the major arteries of the body
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