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1. An electron drops from the L shell to the K shell and gives off an X-ray with a wavelength of 0.0205 nm. What is the atomic number of this atom?
2. A radioactive substance has a decay constant equal to 8.9x10^-3s-1. What is the half-life of this substance?
3. How many rad of 200-keV X-rays cause the same amount of biological damage as 50 rad of heavy ions? Explain please.
a proton enters the gap between a pair of metal plates an electrostatic separator that produces a uniform vertical
Nate the Skate was an avid physics student whose main non-physics interest in life was high-speed skateboarding. In particular, Nate would often don a protective suit of Bounce-Tex, which he invented, and after working up a high speed on his skate..
A child slides across a floor in a pair of rubber-soled shoes. The frictional force acting on each foot is 20.0 N. The footprint area of each shoe sole is 16.0 cm2, and the thickness of each sole is 4.30 mm. Find the horizontal distance by which the ..
what is the magnitude of the first 2nd and 3rd wire i 5.4a b 3.06cm l 32.2 cm. there is three wires label 123 and b is
Assume that wind, which forced a fluids motion along a north to south path suddenly ceases at latitude 45oN and the only acceleration to continue is due to the Coriolis force. find the time it takes to complete one full circle
A medical x-ray beam has wavelength 1.34nm . (a) What's the energy of one photon in this beam? (b) How many photons are in a typical chest x-ray dose that delivers 0.021J of energy?
a hollow conducting sphere with an outer radius of 0.245 m and an inner radius of 0.200 m has a uniform surface charge
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
If a flea can jump straight up to a height of 0.380 m, What is its initial speed as it leaves the ground
The density of free electrons in gold is 5.90 x 10^28 m-3. The resistivity of gold is 2.44 x 10-8 at a temperature of and the temperature coefficient of resistivity is 0.004 ()-1. A gold wire, 1.30mm in diameter and 27cm long, carries a current of..
A horse races once around a circular track in a time of 118s, with a speed of 17 m/s. What is the radius of the track? How do you go about solving this.
Tube A, in a 20°C room, is observed to support standingwaves at frequencies of 48 Hz, 60 Hz and 72 Hz, but not at anyfrequencies in between (but possibly at higher and lower frequencies). Meanwhile tube B, which is the same length, supports standi..
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