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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 canoe has a velocity of 0.55m/s southeast relative to the earth. The canoe is on a river that is flowing 0.60m/s east relative to the earth, Find the magnitude of the velocity of the canoe
An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff
An automobile tire is inflated with air originally at 10°C and normal atmospheric pressure. Determine what is the tire pressure
A current with sinusoidal time-dependence, whose peak value is 3.55 A and frequency is 775 cycles per second, Calculate the average power dissipated by the loop
A 23.5 kg gold bar at25.5°C is placed in a large,insulated 0.800 kg glass container at 15.0°C with 2.00 kg ofwater at 25.0°C. Calculate the final equilibrium temperature
A human hair is placed directly in front of the opening of a laser pointer. The light has a wavelength of 647.8 nm. Determine the approximate thickness of the hair
A spherical concave lens has a focal length of 20cm, and an object is placed 15cm from the lens. estimate of the image distance and give image characteristics
A distant galaxy is moving away from the earth with a speed that results in each wavelength received on the earth being shifted so that wavelength = 1.75. Find the speed of the galaxy relative to the earth
A ball is thrown vertically upward at an initial speed of 20 m/s what is its total time in flight
008 10.0 points A length of metal wire has a radius of 0.006 m and a resistance of 0.08 ?. calculate the density of free electron in the wire
A parallel-plate capacitor with only air between the plates is charged by connecting it to a battery. What is the dielectric constant of this material
1 what is the purpose of the deflection plates in the crt?2 how does the oscilloscope produce a stationary pattern of
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