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The Bohr model can be applied to singly ionized helium He+ (Z=2). Using the model, consider the series of lines that is produced when the electron makes a transistion from higher energy levels into the nf = 3 level. Some of the lines in the series lie in the visible region of the spectrum (380 nm - 750 nm). What are the (a)minimum value and (b) maximum value of ni for the energy levels from which the electron makes the transitions corresponding to these lines?
A rock is thrown from the edge of a cliff to theground 16.0 m below. The rock has an initial velocity of 18.5 m/s, directed 40.0° above the horizontal.
A ceiling fan is turned on and reaches an angular speed of120 rpm in 20 seconds. Through how many revolutions does the fan turn
A 260 wooden raft floats on a lake. When an 80 man stands on the raft, it sinks 5.0 deeper into the water. When he steps off, the raft vibrates for a while. What is the frequency of vibration.
A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity by a factor of 350. When a jet aircraft is taking off.
A 180 ib soldier had an accident: He fell down from a helicopterhoverin at 150 ft above a sno packed ground. evaluate the direction of this net acceleration
A toy top with a spool of diameter 5.0 cm has a moment of inertia of 3.0 X 10^5 kgm2 about its rotation axis. To get the top spinning, its string is pulled with a tension of 0.30 N. How long does it take for the top to complete its first five revolut..
Point charges of 6.2*10^-8 C and -6.4*10^-8 C are placed 72 cm apart. A third point charge of 6.3*10^-8 C is placed half way between the first two point charges
A uniform bar is 5.00 m long and weighs 975 N. A weight of 255 N is attached to one end while a weight of 375 N is attached 1.50 m from the other end. Find the tension in the cable
The light shining on a diffraction grating has a wavelength of430 nm (in vacuum). How many lines per centimeterdoes the grating have
A train is traveling with a speed of 16.0 m/s relative to Earth. What is the velocity of the baseball relative to Earth
A solenoid of radius 1.0 m with 740 turns and a length of 4.6 m surround a pigeon cage. What current must be in the solenoid
while exploring a cave a spelunker starts at the entrance and moves the following distances 75.0 m north 300 m east 200
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