A photographic flash unit consists of a xenon-filled tube. It givers a flash of average power `2000 W` for `0.04 s. The flash is due to discharge of a fully charged capacitor of `40 muF` The valtage to which it is charged before a flash is given by The unit is .

A photographic flash unit consists of a xenon-filled tube. It gives a flash of average power 200 W for 0.04s. The flash is due to discharge of a fully charged capacitor of 40muF . The voltage to which it is charged before a flash is given by the unit is

A photographic flash unit consists of a xenon-filled tube. It gives a flash of average power 200 W for 0.04s. The flash is due to discharge of a fully charged capacitor of 40muF . The voltage to which it is charged before a flash is given by the unit is

For flash pictures, a photographer uses a capacitor of 30muF and a charger that supplies 3xx10^(3) V. find the charge and energy expended in joule for each flash.

A 1.00 muF capacitor is charged by a 40.0 V power supply. The fully charged charged capacitor is then discharged through a 10.0 mH inductor. Find the maximum current in the resultaing oscillations.

It is possible to take a high quality photograph of a very fast moving object by illuminating the object for quite a small fraction of a second. You may have come across photographs of a bullet penetrating a banana or an apple in many text books or magazines. This is called 'stop action' photography because the fast moving object travels a very short distance during the time of illumination. Harold Edgerton, the inventor of stroboscope, was a pioneer of this kind of photography. A normal photographic plate works properly if it receives an energy of 4J during the exposure. To release this energy in a very small fraction of time, huge amount of power is required. Such huge power can not be generated directly from a battery because of its high internal resistance. To produce such power a capacitor is used. The time in which a capacitor discharges can be very short. Although, theoretically it would take a long time for a capacitor to discharge completely, it discharges almost completely in about 10 time constant. Consider the following situation A capacitor of 200muF storing 4J energy is made to discharge through a flash light in 2ms. This setup is used to take the picture of a bullet moving at a speed of 100m//s Assume that the flash light acts as a resistor and there is no other resistance in the circuit. What is the order of energy delivered to the flash light in 0.2 ms(approx).

It is possible to take a high quality photograph of a very fast moving object by illuminating the object for quite a small fraction of a second. You may have come across photographs of a bullet penetrating a banana or an apple in many text books or magazines. This is called 'stop action' photography because the fast moving object travels a very short distance during the time of illumination. Harold Edgerton, the inventor of stroboscope, was a pioneer of this kind of photography. A normal photographic plate works properly if it receives an energy of 4J during the exposure. To release this energy in a very small fraction of time, huge amount of power is required. Such huge power can not be generated directly from a battery because of its high internal resistance. To produce such power a capacitor is used. The time in which a capacitor discharges can be very short. Although, theoretically it would take a long time for a capacitor to discharge completely, it discharges almost completely in about 10 time constant. Consider the following situation A capacitor of 200muF storing 4J energy is made to discharge through a flash light in 2ms. This setup is used to take the picture of a bullet moving at a speed of 100m//s Assume that the flash light acts as a resistor and there is no other resistance in the circuit. What is the initial current in the circuit

It is possible to take a high quality photograph of a very fast moving object by illuminating the object for quite a small fraction of a second. You may have come across photographs of a bullet penetrating a banana or an apple in many text books or magazines. This is called 'stop action' photography because the fast moving object travels a very short distance during the time of illumination. Harold Edgerton, the inventor of stroboscope, was a pioneer of this kind of photography. A normal photographic plate works properly if it receives an energy of 4J during the exposure. To release this energy in a very small fraction of time, huge amount of power is required. Such huge power can not be generated directly from a battery because of its high internal resistance. To produce such power a capacitor is used. The time in which a capacitor discharges can be very short. Although, theoretically it would take a long time for a capacitor to discharge completely, it discharges almost completely in about 10 time constant. Consider the following situation A capacitor of 200muF storing 4J energy is made to discharge through a flash light in 2ms. This setup is used to take the picture of a bullet moving at a speed of 100m//s Assume that the flash light acts as a resistor and there is no other resistance in the circuit. If we use a lens of power 10 diopters, the lens to photographic plate distance is 15cm and the bullet moves perpendicular to the principal axis, what is the distance covered by bullet as seen on photographic plate.

Someone suggested using a 5,000 muF capacitor to generate flash for a camera. A capacitor is to charged slowly and completely up to a potential difference of 10V. At the time of generating flash, all stored energy of a capacitor is discharged through a discharge tube in such a manner that flash only time 100 mus to release the total energy of the capacitor. Calculate the power of camera flash.

Figure shows the circuit of a flashing lamp, used at construction sites. The fluorescent lamp L, having negligible capacitance, is connected in parallel across the capacitor C of an RC circuit . There is a current through the lamp only when the potential difference across it reaches the breakdown voltage V_L) . In this event, the capacitor discharges completley through the lamp and lamp flashes momentarily. Consider an instant, when the capacitor has just discharged through the flash light. Taking this instant as t=0, the time after which the lamp flashes momentarily is given by