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Q1. A home fragment found in a cave believed to have been inhabited by early humans contains 0.21 times as much14C as an equal amount of carbon in the atmosphere when the organism containing the bone died. Find the approximate age of the fragment. Half life of 14C is 5730 Years.
Q2. Compare to a particles with the same energy, β particles that can much more easily penetrate through matter. Why is this?
Q3. In what ways do photons resemble other particles such as electrons? In what ways do they differ? Do photons have mass? Do they have electric charge? Can they be accelerated? What mechanical properties they have?
The electron beam inside a television picture tube is 0.4 mm in diameter and carries a current of 55 µA. What is the power delivered to the screen by the electron beam
Calculate the per capita energy use for China and India. The populations of each country should be obtained from reliable sources. Express your final answer in units of kcal per day per person.
A playground is on the flat roof of a city school, 7.00 m above the street below. The vertical wall of the building is 8.00 m high, forming a 1.00 m high railing around the playground. Find the speed at which the ball was launched
Sunlight shines directly on to the wall of a large soap bubble (n = 1.33) which is floating in air (n=1). What is the minimum thickness it could have to produce completely destructive interference for blue light (%u03BB = 475 nm)
A boy coasts down a hill on a sled, reaching a level surface at the bottom with the speed of 8.4 m/s. If the coefficient of friction between sled's runners and snow is 0.040.
For the system shown , the block has a mass of 1.5 kg and the spring constant k=8.0 N/m. find the number of oscillations made by the block during the time interval required for the amplitude to fall to one-third of its initial value
For a particular RLC series circuit, the capacitive reactance is 9.75 ?, the inductive reactance is 42.7 ?, What is the maximum voltage across the circuit?
A certain commercial mass spectrometer (Fig. 28-12) is used to separate uranium ions of mass 3.92 x 10-25 kg, calculate the thermal energy (in J) produced in the cup in 1.07 h
A wagon is coasting at a speed vA along a straight and level road. When thirty-four percent of the wagon's mass is thrown off the wagon, parallel to the ground and in the forward direction, the wagon is brought to a halt. If the direction in which th..
In the movie Thelma and Louise, the two actresses drove off a cliff at the end. In preparation for the scene, their stunt double determined that the cliff was 50.0m high. The director wants the car to land 90.0m from the base of the cliff close ..
A monochromatic source light source having a wavelength of 547 nm is used to check the calibration of a Michelson interferometer. how many fringes will move past this fixed point
Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 44.0, What is her average speed on the return trip
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