### Energy Absorbance

A film badge worn by a radiologist indicates that she has received an absorbed dose of 2.3e-5 Gy. The mass of the radiologist is 67 kg. How much energy has she absorbed? Answer in mJ.

Explore BrainMass

- Anthropology
- Art, Music, and Creative Writing
- Biology
- Business
- Chemistry
- Computer Science
- Drama, Film, and Mass Communication
- Earth Sciences
- Economics
- Education
- Engineering
- English Language and Literature
- Gender Studies
- Health Sciences
- History
- International Development
- Languages
- Law
- Mathematics
- Philosophy
- Physics
- Political Science
- Psychology
- Religious Studies
- Social Work
- Sociology
- Statistics

A film badge worn by a radiologist indicates that she has received an absorbed dose of 2.3e-5 Gy. The mass of the radiologist is 67 kg. How much energy has she absorbed? Answer in mJ.

The K characteristic X-ray line for tungsten has a wavelength of 1.84 10-11 m. What is the difference in energy between the two energy levels that give rise to this line? Express in joules and eV.

A proton is located at a distance of 0.410 m from a point charge of +8.30 µC. The repulsive electric force moves the proton until it is at a distance of 1.56 m from the charge. Suppose that the electric potential energy lost by the system is carried off by a photon that is emitted during the process. What is its wavelength?

How close would two stationary electrons have to be positioned so that their total mass is 8 times what it is when the electrons are very far apart?

Calculate the classical frequency for the light emitted by an atom. To do so, note that the frequency of revolution is v/2pir, where r is the Bohr radius. Show that as n approches infinity in f= 2pi2mk2e4/h3 times 2n-1/(n-a)2 n2 the expression varies as 1/n3 and reduces to the classical frequency.

For two distinguishable, non-interacting particles in a box, Quantum Mechanics says the energy must be, for each individual particle, E = (h^2)/(8mL^2)*[(n_x)^2 + (n_y)^2 + (n_z)^2) where L is the length of one side of the cube, m is the mass of the particle, and the n's are independent integers that can take any value fr

Please see the attached file for full problem description. --- A child's pogo stick stores energy in a spring with a force constant of 2.50 x 10^4 N/m. At position A (XA= -0.100 m), the spring compression is a maximum and the child is momentarily at rest. At position B (Xb=0) the spring is relaxed and the child is moving u

Trying to visualize this scenario so I can draw a picture, but I am drawing a blank. I think that I have to use the mgh equation and mv^2/r equation. Also, do you think you could offer some additional questions that might be relevant to this problem so I can practice. See attached file for full problem description.

In a vertical plane, a uniform sphere, mass m, radius r, released from rest at a point h meters above ground level, rolls without slipping down a straight section of track then around the inside of a circular track of radius R. Given R>>r. Find the minimum initial height h, such that the sphere barely maintains contact at th

A cart has four wheels in the shape of uniform cylinders, each of whose mass is m= 20 kg. The total mass of the cart, including the cylinders, is M= 1000 kg. The total KE (kinetic energy) of the cylinders is what percentage of the total KE of the moving cart?

As Fig. 8-44 shows, a 4.5 kg block is accelerated by a compressed spring whose spring constant is 640 N/m. After leaving the spring at the spring's relaxed length, the block travels over a horizontal surface, with a coefficient of kinetic friction of 0.25, for a distance of 5.9 m before stopping. (a) What is the increase in

The only force acting on a 2.4 kg body as it moves along the x axis varies as shown in Fig. 7-33 (attached). The velocity of the body at x = 0 is 4.0 m/s. (a) What is the kinetic energy of the body at x = 3.0 m? (b) At what value of x will the body have a kinetic energy of 8.0 J? (c) What is the maximum kinetic energy attai

A single conservation force F(x) acts on a 1.0 kg particle that moves along an x-axis. The potential energy U(x) associated with F(x) is given by: U(x) = -4x e^(-x/4) J, where x is in meters. At x = 5.0m the particle has a kinetic energy of 2.0J. a) What is the mechanical energy of the system? b) Make a plot of U(x) as a

Please see the attached file for full description of the problem concerning volume and pressure of gases in a thermally isolated container.

In physics lab we collided two objects that then both started moving in the same direction. We measured the velocities through two photo gates. We know momentum was lost because the velocities decreased after the collision. What are two physical reasons for the loss of momentum?

Please see the attached files for full problem description.

Bridge crane carrying load sudden stop swing how far Please see the attached file for full problem description.

My professor was trying to explain the concept of the interrupted pendulum. I do not understand why most pendulums have the same period and why, when you interrupt a pendulum, it will still reach the same height.

What is the energy of the photon emitted when the electron of a hydrogen atom makes a transition from the quantum level n=3 to the level n=1?

Estimate the minimum uncertainty in energy that corresponds to the uncertainty in time of 1x10^(-12seconds).

General Theory of Relativity. Description of motion of a test particle in the non-null electromagnetic field.

Find the Lagrangian function. Please see the attachment. The bottom part of the attachment that got cut off just says "of motion of the particle."

A cylinder contains a mixture of helium and argon gas in equilibrium at a temperature of 152 degrees Celsius. a) What is the average kinetic energy of each type of molecule (J/molecule)? b) What is the rms speed of each type of molecule? (m/s)

An example says, Na=10^18cm^-3 Nd=10^16cm^-3 Dp=10cm^2/s Dn=25cm^2/s tpo=10^-7s tno=10^-7s "We can then calculate the following parameters:" Lp=1.0x10^-3cm Ln=1.58X10^-3cm pno=2.25x10^4cm^-3 npo=2.25x10^2cm^-3 How were the lengths and minority carrier concentrations derived from the above information? And math

A car maintains a maxiumum speed of 20 meters per second on an uphill road at an angle of 30 degrees. The weight of the car is 10,000 newtons. Determine (a) Power needed to maintain the speed uphill in Kw. (b) Minimum time it will take to accelerate from rest to 30 meters per second on a level road. (c) Max speed it will b

"A car is designed to get its energy from a rotating flywheel with a radius of 2.20 m and a mass of 499 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 5120 revolutions per minute. Find the kinetic energy stored in the flywheel."

Your company is designing a desk-top sized proton accelerator, using a 500MN/C superconducting magnet to hold the protons in a circular path. Estimate the maximum kinetic energy that your accelerator can give protons. Express your answer in the conventional particle physics unit of electron-volts, where 1 eV=1.6*10^-19J. For

Problem: m1 starts from rest at height h. At the bottom of the frictionless slope stands mass m2. m1 is then let go, and collides with m2 an elastic collision. What will be the final height m1 will attain after recoiling from m2?

In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 2.00 m and cross the bar with a speed of 0.670 m/s?

A child's toy consists of a piece of plastic attached to a spring. The spring is compressed against the floor a distance of 2.00 cm, and the toy is released. If the toy has a mass of 90 g and rises to a maximum height of 50.0 cm, estimate the force constant of the spring (in N/m). I need help on which equation/formula to use a