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(a) What is the probability that an electron will tunnel through a 0.50-nm air gap from a metal to a scanning tunneling microscope probe if the work function is 4.0 eV?
(b) The probe passes over an atom that is .05 nm tall off the surface. By what factor does the tunneling current increase?
The period of the earth around the sun is 1 year and its distance is 150 million km from the sun. What is the orbital velocity of the asteroid
A piece of Nichrome wire has a radius of 5.00 x10-4 m. It is used in a laboratory to make a heater that uses 2.00 102 W of power when connected to a voltage source of 120 V. Ignoring an effect of temperature on resistance, estimate the necessary l..
The protein ?-lactalbumin (molecular weight = 14,000) has been studied under different solution conditions by dynamic light scattering. At pH 7 and 40°C in a dilute solution the diffusion coefficient was found to be 14.25×10-7 cm2/s.
Typical field strengths are a few femoteslas (1fT=10^-15T). An adult brain is about 140mm wide, A reasonable magnetic field is 4.35fT at the sensor. According to this model, what is the current in the brain?
What is work done by the non-conservative force
A conducting rod of mass m is sliding on frictionless conducting rails in a region that has a static, uniform magnetic field directed into the page as shown. The rails slope downward from the end with the resistor so that the rod of mass m slides dow..
You find an unlabeled box of fine needles, and want to determine how thick they are. A standard ruler won't do the job, What is the diameter of the needle
The overall magnification of anstronomical telescope is desired to be 24X. if an objectiveof 75cm focal lenght is used, what must be the focal length of the eyepiece
The car drives straight off the edge of a cliff that is 57 m high. The investigator at the scene of the accident notes that the point of impact is 130 m from the base of the cliff.
You measured the speed of sound to be 384.9 m/s. Your lab partner measured it to be 342.2 m/s. What was the percent difference between these values
How much energy can be stored in a capacitor with two parallel plates, each with an area of 64.0 cm2 and separated by a gap of 1.7 mm, filled with porcelain whose dielectric constant is 5.9, and holding equal and opposite charges of magnitude 370. ?C
two basketball players collide head on. play a weighs 80 kg and is travelling 2.5m/s to the right while player b weighs 68 kg and is travelling 1.2 m/s to the left, what is the change in momentum of player a
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