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The electronic energy level of a certain system are given by En = E1*n2, where n = 1, 2, 3. Assume that transitions can occur between all levels. If one wanted to construct a laser from this system by pumping the n = 1 to n = 3 transition, which energy level or levels would have to be metastable?
The lower weight is a light bag filled with sand. Assume a pin pokes a hole in the bag and the sand slowly leaks out while the puck is revolving. What would be the puck's speed after all of the sand is gone.
An 80 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 82 cm. What is the speed of the arrow as it leaves the bow
a block of mass m 0.2kg in simple harmonic motion has an amplitude of 3.5 cm and a maximum speed of 70 cms. what is the
A converging lens (f1 = 24.0 cm) is located 56.0 cm to the left of a diverging lens (f2 = -28.0 cm). An object is placed to the left of the converging lens, and the final image produced by the two-lens combination lies 19.8 cm to the left of the d..
The launching speed of a certain projectile is 5.4 times the speed it has at its maximum height. Calculate the elevation angle at launching
Over a certain region of space, the electric potential is V = 5x - 5x2y + 2yz2. (Use any variable or symbol stated above as necessary.) What is the magnitude of the field at the point P, which has coordinates (5, 0, -5) m
A radioisotope has a half-life of 5.00 min and an initial decay rate of 5500 Bq . What is the decay constant? What will be the decay rate at the end of 5.00 min.
If the machine converts half of Bills power into electricity, is there enough electric power to light a 60watt light bulb? How many Joules of energy does Bill use if he runs on the exercise machine for 1 hour?
What is the distance (in mm) separating the violet (lambda = 400nm) in the first-order band from the red (lambda = 600nm) in the second order.
There is a uniform magnetic field present, given by B=0.003i + 0.004j + 0.002k, where i, j, k are the unit vectors along the cartesian coordinate axes') in units of Tesla. Compute the y-component of the magnetic force acting on a segment of wire ..
A riffle with a mass of 3.00kg fires a bullet with a mass of 3.50 x 10 ^ -3 kg at a speed of 330 m/s. What is the recoil speed of the riffle
You are trying to overhear a juicy conversation, but from your distance of 15m. It sounds like only an average whisper of 20 dB. So you decide to move closer to give the conversation a sound level of 60 dB instead. How close must you come.
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