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Q1. The energy levels of a certain atom have the following pattern:
E1= -340eV (n = 1),
E2 = -85 eV (n = 2),
E3 = -37.78eV (n = 3), and so on..
An electron drops from n=3 to n=1 in this atom. What is the wavelength in nanometers of the photon emitted in the process? Planck's constant h = 6.626 x 10-34 Joule-sec, 1eV = 1.6 x 10-19 Joules.
Q2. How Many photons per second come out of a ruby laser that is giving out 2 milliwatts of power? (1 watt = 1 Joule/sec and 1 eV = 1.6 x 10-19 Joules). Look up the for what wavelength a ruby laser produces.
Q3. You have three liquids: ethyl alcohol, chloroform and ice-cold Water. When you mix 100 grams of ethyl alcohol at a temperature of T=25 Celsius with 200 grams of ice-cold water (T= 0C), the resulting mixture has a temperature of 5.55 C. When you mix 200 grams of ethyl alcohol at a temperature of T=25 Celsius with 100 grams of chloroform at T=10 C, the resulting mixture has a temperature of 22.22 C. What is the final temperature when you mix 150 grams of ethyl alcohol at T=15 C with 250 grams of chloroform at T=5 C? (You are given that the specific heat capacity at water is 4.2 J/g.K).
A system does 136 J of work on its environment and gains 66 J of heat in the process. compute the change in the internal energy of the system
An ideal gas sample occupies a container of volume 0.70L at STP. Find the number of moles in the sample
On April 13, 2029 (Friday the 13th!), the asteroid 99942 mi Apophis will pass within 18600 mi of the earth-about 1/13 the distance to the moon! It has a density of 2600 kg/m^3, how much kinetic energy would it deliver
A beam of 16MeV deuterons (m=2mp) from a cyclotron falls on a copper block. The beam is equivalent to a current of 15 microA, At what rate do deuterons strike the block
a solid uniform sphere of mass 2.0 kg and radius 1.7m rolls without slipping down an inclined plane of height 6.7 m.
A laser beam is incident at an angle of 43.0° to the vertical onto a solution of corn syrup in water. What is its speed in the solution
A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. what is the smallest insect a bat can detect
Animals in cold climates often depend on two layers of insulation: a layer of body fat [of thermal conductivity 0.200W/(m dot K) ] surrounded by a layer of air trapped inside fur or down. We can model a black bear (Ursus americanus) as a sphere 1...
A 210 g, 49 bcm diameter turntable rotates on frictionless bearings at 54 rpm . A 25 g block sits at the center of the turntable. A compressed spring shoots block radically outward along a frictionless groove in the surface of the turntable.
It takes a student t = 5.2 s to push a block m = 6 kg at a constant velocity over a distance of d = 4.6 m. How much power was applied to the block in Watts
A wheel with rotational inertia .146 kg-m2 turns through 40 rev as it slows down from an angular speed of 1.5 rad/s to a stop, what is the angular deceleration
If a 12.1 eV photon was absorbed by a hydrogen atom initially in its ground state, which then emits 2 photons, what are the emitted photon wavelengths
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