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An X-ray with a frequency of 3.74 * 10^20 Hz is incident on a thin piece of metal. The lower frequency X-ray on the other side is observed deflected at 48 (degrees). What is the frequency of the deflected X-ray?
Radioactive isotopes frequently occur together in mixtures. Assume a 400g sample contains, with a half-life of 12 days, and, with a half-life of 4.5 days. If there are firstly twice as many calcium atoms as there are barium atoms, what will be the ra..
An electron orbiting a hydrogen atom has an initial energy of -0.544 eV. The atom emits a photon, then absorbs a photon, ending up with an energy of -3.4 eV. What was the wavelength of the emitted photon?
A steady beam of alpha particles (q = + 2e)traveling with constant kinetic energy 18 MeV carries a current of 0.30 µA. If the beam is directed perpendicular to aplane surface, how many alpha particles strike the surface in 3.0s
q1. a 485 kg sailboat has an acceleration of 0.50 ms2 at an angle of 51deg north of east. find magnitude and direction
Draw the two-dimensional lattice whose primitive translation vector of the lattice is 2aix+aly. Show two primitive and two non-primitive unit cells, one of each should be non-rectangular.
An artificial satellite circling the Earth completes each orbit in 118 minutes. Find the altitude of the satellite
Two circular plates of radius 5.22 cm possess a charge separation of 8.252 ?C. find the electric field between the two plates
K40 (half-life=1.3x10E9 years) composes approximately 0.012% of the potassium found in nature. By weight, the human body is approximately 0.35% potassium. Calculate the total radioactivity that results from K40 decay in a 75 kg human.
A meter rule (of no mass), hangs from its mid-point. Find at what mark on the meter rule must a 2 kilogram mass hang so that it balances
A square wire 2.0 cm on each side is oriented so that 5.00 mT magnetic field makes a 30 degree angle with the normal to the plane of the square. if a 1.0 mA current causes a 25 N x m torque on the wire, how many loops does the wire make?
A 4.00 kg mass is connected to a spring with a spring constant of 9.00 N/m. If during the oscillation the velocity is 12.0 cm/s when the displacement is 4.00 cm, then what is the maximum velocity of the simple harmonic motion?
Two circular hoops, with masses and radii in the ratios m2/m1=4 and R2/R1=4, rotate with angular speeds in the ratio ?2/?1=2. What is the ratio of the kinetic energies K2/K1 ?
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