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The technique known as potassium-argon dating is used to date old lava flows and thus any fossilized skeletons found in them, like this 1.8-million-year-old hominid skull. The potassium isotope ^40K has a 1.28 billion year half-life and is naturally present at very low levels. ^40K decays by beta emission into the stable isotope ^40Ar. Argon is a gas, and there is no argon in flowing lava because the gas escapes. Once the lava solidifies, any argon produced in the decay of ^40K is trapped inside and cannot escape.
What is the age of a piece of solidified lava with a ^40Ar/^40K ratio of 0.31?
q1. a ship sets out to sail to a point 156 km due north. an unexpected storm blows the ship to a point 118 km due east
Two loudspeakers are located 3.57 m apart on an outdoor stage. A listener is 26.7 m from one and 27.7 m from the other. What is the lowest frequency that gives the maximum signal (constructive interference) at the listener's location
A car starts from rest and accletation uniformly for 10s to a velocity of 8m/s. Find the value of accleration, retardation and total time taken
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 2.3 × 10-10 T. How much energy does this wave carry through the window during a 46-s phone call
Two 2.7cm -diameter disks face each other, 2.7mm apart. They are charged to ±14nC. What is the electric field strength between the disks
A 50.0 gram chunk of ice is taken from a freezer at -20 C, What is the minimum amount of stove energy required
An inclined plane with friction, a massless/frictionless pulley, and two blocks, with m1 hanging and m2 resting on the plane. How do you find the acceleration
A garden plot must have a central planting area of length 13 m and width 8 m. There is to be a sidewalk around its edge of width w. If the total area, planting area plus sidewalk area, is 150 m^2, what is the sidewalk width w in meters.
A cannon ball is fired from ground level with a speed of 60.0 m/s at an angle of 58 deg. above the horizontal. what is the speed of the cannon ball when it is directly above the wall
a certain system has 6x10624 degrees of freedom, which internal energy increases by 1%; then, by what factor does the number of accessible estates increase
n = 3.60 mol of Hydrogen gas is initially at T = 340 K temperature and pi = 3.32×105 Pa pressure, How much entropy did the gas emit
A rifle is aimed horizontally at a target 50 m away. The bullet hits the target 2.0 cm below the aim point. What is the bullet's flight time
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