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a 92-kev x-ray is compton-scattered through an angle of 10o what is the energy of the x-ray after scattering
light of wavelength 530 nm passes through a slit of width 0210 mma the width of the central maximum on a screen is 850
what is the change of energy when an electron of boron travels from the 4th energy level to the 2nd energy
during exercise a person may give off 145kcal of heat in 20min by evaporation of water at 20cfrom the skin the heat of
the half-life of the radioactive isotope bismuth-210 is 501 days how many days will it take for the mass of a sample of
150 ml of water at 500c is placed in the freezer compartment of a refrigerator with a coefficient of performance of 600
you measure the activity of a radioactive sample then wait a few days and measure it again after 60 days the activity
a 275 g aluminum block is warmed to 659 degrees c and plunged into an insulated beaker containing 551g water initially
the radioactive isotope carbon-14 is used for radiocarbon dating the half-life of carbon-14 is 5730 years a wooden
an electron is a hydrogen atom drops from the n6 state to the ground state what is the frequency of the photon that is
when 221 j was added as heat to a particular ideal gas the volume of the gas changed from 37 cm3 to 60 cm3 while the
a solid cylinder of radius r1 30 cm length h1 60 cm emissivity 087 and temperature 35degc is suspended in an
it takes 260 s for a small ball with a mass of 0030 kg released from rest from a tall building to reach the ground
a proposed space station includes living quarters in a circular ring 605 m in diameter at what angular speed should the
a plastic bag is filled with hydrogen at atmospheric pressure and 260 oc assume that the mass of the bag is negligible
a 100kg ball is at rest on the floor in a 210m 210m 210m room of air at stp air is 80 nitrogen n2 and 20 oxygen o2 by
a calculate the efficiency of a reversible engine that operates between the temperatures 6200deg c and 3450deg cb if
when a metal is irradiated with 410-nm photons the stopping potential is 12 ev find the cutoff wavelength in nm for
if 450ml of ethanol density 0789 gml initially at 90 degrees c is mixed with 450ml of water density 10gml initially
a heat engine takes in 126 kj of heat from a reservoir at 820 k and exhausts 88 kj to a reservoir at 292 ka what is the
a woman takes her dog rover for a walk on a leash to get the little pooch moving forward she pulls on the leash with a
a force of 392 n is exerted on the small piston of diameter 125 cm to support a 1600-kg car on the hydraulic lift shown
a block of mass 46 kg slides 15 m from rest down an inclined plane making an angle of 28 o with the horizontal if the
the wave length associated with the cutoff frequency for silver is 3250 nm find the maximum kinetic energy of the
can someone please explain how to do this problem i asked before but the past answers didnt really help a rectangular