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Browsing Animations: ftemo
25 Animations
cp-mfield-02.iwp
A charged particle moves under the influence of a magnetic field oriented along the z-axis (perpendicular to the screen). The direction of positive B is +z (outward from screen). The blue vector on the particle represents its acceleration. The grid scale is located under the tab marked by two boxes.
em-ratio-1b.iwp
An electron is accelerated from rest under the influence of a potential V1 (not shown). At the origin, the electron enters a uniform electric field. The electric field is oriented in the -y direction and is produced by parallel plates with a potential difference equal to V1.
em-ratio-1c.iwp
An electron is accelerated from rest under the influence of a potential V1 (not shown). At the origin, the electron enters a uniform magnetic field produced by Helmholtz coils. Within the area encircled by the coils, the electron follows a circular path.
em-ratio-1d.iwp
An electron is accelerated from rest under the influence of a potential V1 (not shown). At the origin, the electron enters crossed electric and magnetic fields. The electric field is oriented in the -y direction and is produced by parallel plates with a potential difference equal to V2. The magnetic field is oriented in the -z direction (into screen) and is produced by Helmholtz coils.
em-ratio-2d.iwp
An electron is accelerated from rest and enters an electric field produced by parallel plates with a constant potential difference across them.
gas-laws-balloon-01.iwp
A balloon expands as the temperature of the gas inside of it rises. How do the initial and final volumes and pressures compare?
gas-laws-bubble-01b.iwp
A balloon is released from the bottom of a deep lake where the temperature is always 4 degC and rises to the top, where the pressure is standard atmospheric pressure. Assume that the balloon rises slowly enough that the temperature of the gas inside adjusts to its surroundings. Determine the pressure at the initial depth and the temperature of the air above the lake. The depth of the balloon and its radius are given as Outputs.
gas-laws-piston-v2-02.iwp
A block resting on a piston compresses an ideal gas enclosed in a box. The gauge to lower right indicates the absolute pressure of the gas in atmospheres. A thermometer indicates the temperature of the gas in degrees Celsius. The dimensions of the gas volume are initially 0.0800 m x 0.0800 m x 0.280 m, where the latter dimension is the dimension perpendicular to the screen.
gas-laws-piston-v2-03.iwp
A block resting on a piston compresses 0.100 moles of an ideal gas enclosed in a box. The gauge to lower right indicates the absolute pressure of the gas in atmospheres. A thermometer indicates the temperature of the gas in degrees Celsius. The dimensions of the gas volume are initially 0.0800 m x 0.0800 m x 0.280 m, where the latter dimension is the dimension perpendicular to the screen.
gas-laws-piston-v2-04.iwp
A pump increases the pressure in a box enclosing 0.100 moles of an ideal gas. A pressure gauge indicates the absolute pressure of the gas in atmospheres. The dimensions of the gas volume are 0.0800 m x 0.0800 m x 0.280 m. A thermometer indicates the temperature of the gas in degrees Celsius. More precise temperatures may be determined by calculation.
lenzlaw-01.iwp
A bar magnet is pushed into a loop of conducting wire. While the magnet is moving into the loop, what is the direction of the induced current in loop from the point of view of the observer?
lenzlaw-02b.iwp
A bar magnet is pulled out of a loop of conducting wire. While the magnet is moving out of the loop, what is the direction of the induced current in loop from the point of view of the observer? The red end of the magnet is the North pole.
mass-spec.iwp
Two singly-ionized isotopes of the same element are injected at the same velocity into a region of uniform magnetic field pointing out of the screen. (There is no field below the x-axis). Determine the ratio of the masses of the isotopes.
point-interference-02.iwp
Waves are incident from the left on a barrier. At t = 0, two apertures open in the barrier. Waves emerging from the two apertures interfere. At positions where the two waves reach the screen in phase, the waves will interfere constructively. Note that when Point P is at the midpoint of a fringe, the ratio of the Path Difference to the Wavelength (see Outputs) is an integer. This is the condition for constructive interference. Determine the wavelength. Note that the distance between grid markings is 10 cm. Refer to the Enlarged View to see the geometrical relationships between the various parameters.
point-interference-03.iwp
Waves are incident from the left on a barrier. At t = 0, two apertures open in the barrier. Waves emerging from the two apertures interfere. The pattern of bright interference fringes is shown on the screen. Determine the separation of the slits.
point-interference-04.iwp
Waves are incident from the left on a barrier. At t = 0, two apertures open in the barrier. Waves emerging from the two apertures interfere. Determine the vertical position on the screen of the center of the bright fringe for m = 2 and the dark fringe for m = 1/2.
prism-1b.iwp
A ray of light is incident from air on a prism with index of refraction 1.5. Playing the animation will increase the angle of incidence in 1 degree increments. Normals to the sides of the prism are indicated by red lines. The angle of incidence i is given as an output. The vertex angle v can be adjusted. For a particular angle of incidence, use Snell's Law and the geometry of the prism to determine the angle of refraction at which the ray emerges from the prism on the right.
prism-6b.iwp
The dispersion of white light by an equilateral prism made of crown glass is modeled. The index of refraction ranges from 1.513 for red light to 1.532 for violet light. Playing the animation will decrease the angle of incidence in 1 degree increments. (The colored rays emerging from the prism represent broader bands of color that would appear in an actual situation. That is, the spread of colors from red to blue would be along a continuum rather in discrete lines.) For any particular angle of incidence, determine the angular spread between the emerging red and violet rays, assuming the indices of refraction given above.
rainbow-01.iwp
A rainbow is formed when the direction of sunlight to raindrops is such that a ray internally reflected in a drop refracts out of the drop along a line of sight that reaches the observer. The angular difference between the direction of the sunlight and the direction of the refracted ray to the observer depends on the frequency of the light, since the speed of light in water depends on frequency. This is why a spectrum of colors is produced in the rainbow. The raindrop acts like a prism. The index of refraction of 1.331 is for red light. Run the applet to see how the Angular Difference increases as the index of refraction is increased in increments of 0.001 to the value of 1.343 for violet light at the opposite end of the visible light spectrum. The black lines are normals to the raindrop.
ray-refraction-3g.iwp
The red line at y = 0 represents a boundary between media of different indices of refraction. The path of a light ray is shown in blue. Note that both a reflected and a refracted ray are produced at the boundary. This problem is concerned with the refracted ray. Playing the applet forward or backwards will increase or decrease the angle of incidence. Take measurements from the applet to determine the ratio of the index of refraction of the upper medium to that of the lower medium. You can determine angles of incidence and refraction by finding ratios of the legs of right triangles. In order to improve the accuracy of your measurements, run the applet to obtain the largest angles possible.
ray-refraction-3h.iwp
A ray of light starting from lower left is refracted from Medium 1 to Medium 2 as well as reflected into Medium 1. Playing the applet forward or backwards will increase or decrease the angle of incidence. The normal to the boundary is shown in red. Which medium has the greater index of refraction? How do you know? If n2/n1 is the ratio of the corresponding indices of refraction of the two media, determine the value of n2/n1.
ray-refraction-3i.iwp
A ray of light travels through 3 successive media from 1 to 3.. The indices of refraction of media 1 and 3 are given as inputs. Normals are shown at the boundaries of adjacent media. The angle of incidence in Medium 1 and the angle of refraction into Medium 3 are marked. Which medium has the greatest index of refraction? How do you know? Determine the angle of refraction in Medium 3. (Why isn't it necessary to know the index of refraction or angle of refraction in Medium 2?)
ray-refraction-4e.iwp
The blue, red, and gray areas represent media of different indices of refraction. The path of a light ray incident from the blue medium is shown in yellow. The angle of incidence is given as an output. Playing the applet forward or reverse will increase or decrease the initial angle of incidence. In order to increase the precision with which the incident angle can be read, decrease the Angle Increment. Also change the Starting angle to something very near the angle you're looking for so that you don't have to step through many angles. The problem is to find the relative indices of refraction n1:n2:n3. That is, find the ratios n2/n1 and n3/n2. For good results, measure angles to the nearest tenth of a degree.
refracted-waves-5.iwp
Plane waves of constant frequency move up the screen, crossing from one medium into another. The wave speed decreases in the upper medium. Since the frequency is constant and speed = frequency x wavelength, the wavelength is less in the upper medium. The arrows indicate the incident and refracted rays. The rays are perpendicular to the wavefronts. The red tic marks on the left side of the Animator window are spaced 2.0 cm apart.
refracted-waves-6b.iwp
Plane waves cross a boundary between two media at a non-zero angle of incidence. The angles of incidence and refraction are shown with respect to the normal to the boundary.