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Phys Final- unit 2
| Question | Answer |
|---|---|
| A ____ is a source of direct current | Battery |
| The mass equivalent of a 100 keV photon of radiation can be calculated using | Einstein's Relativity Formula |
| How many gauss make up one SI unit of magnetic field strength? | 10,000 |
| The most efficient type of transformer is the | Shell- type transformer |
| The total current in a parallel circuit is | Sum of individual currents |
| The first batteries were made of stacks of ____ and ____ plates sandwiched together | Zinc and copper |
| What is Ohm's Law | I=V/R |
| Electrical power is measured in ____. | Watts |
| The smallest unit of magnetism is | None- no smallest unit |
| The magnetic intensity of an electromagnet is greatly increased by the addition of a(n) ____ core. | Iron |
| Alternating current is produced by a ____ | Generator |
| On the surface of an electrified object (like a cattle prod), the charges concentrate | On the sharpest curvature |
| The rate of rise and fall of a sine wave is called its ____ | Frequency |
| If the wavelength of a photon of electromagnetic radiation increases by a factor of 2, then its frequency must | Decrease by half |
| The diagnostic range of x-ray energy is | 30-150 kVp |
| The total resistance in a series circuit is | Sum of each individual resistance |
| A transformer has 600 coils on its primary side and 30 coils on its secondary side. What is the voltage on the secondary side when the primary side is 220 V? | 11V. VS/VP=NS/NP |
| An alternating (AC) current is represented by a ____ line. | Sinusoidal |
| A coil of wire called a(n) ____. | Solenoid |
| The current to a transformer must be supplied by a(n)__ source | AC |
| Photons tend to interact with matter ____ in size to its wavelength. | Equal |
| The two basic types of induction are ____ induction and ____ induction. | self and mutual |
| Mechanical motion produces electric current in the ____. | electric generator |
| The circuit element that allows electrons to flow in only one direction is the: | Diode |
| An electrical component that may work through self-induction is the ____. | Transformer |
| Electrification occurs through the movement of | Electrons |
| What is the unit of electric potential? | Volt |
| The rotation of electrons on their axis is the property called | Electron spin |
| The ____ of electromagnetic radiation is constant. | Velocity |
| What is the electromagnetic wave equation? | c = fλ |
| -v^v^- is symbol for what | Resistor |
| Faraday's experiments proved that a current could be induced by a magnetic field only if the field is | Changing |
| The reduction of radiation intensity due to scattering and absorption is called ____. | Attenuation |
| If the intensity of visible light from a flashlight is 4 millilumens (mlm) at a distance of 3 feet, what will the intensity be at 6 feet? | 1 mlm |
| A hertz (Hz) is equal to | 1 cycle per sec |
| What type of material can be made magnetic when placed in an external magnetic field? | Ferromagnetic |
| A charged particle in motion creates a(n) | magnetic field |
| Like charges ____ and unlike charges ____. | Repel, attract |
| The smallest quantity of any type of electromagnetic radiation is a(n) ____. | Photon |
| X-ray system uses an __ to rotate the anode | Induction motor |
| When a group of magnetic dipoles are aligned they create a | Magnetic domain |
| In the United States alternating current goes through a complete cycle every ____ second (hint=1 sine wave). | 1/60 |
| Electrostatic force is ____ proportional to the distance between charges and ____ proportional to the product of the charges. | Inversely, directly |
| In the right hand rule the thumb represents what? | Direction of the current |
| The lowest energy range of the electromagnetic spectrum is | Radiowaves |
| A transformer has 100 coils on the primary side and 300 coils on the secondary side. What will the voltage be on the secondary side if the primary side is supplied with 120 volts? | 360 V |
| X-rays are usually identified by their ____. | Energy |
| The energy of a photon is directly proportional to its | Frequency |
| Lenz's law states that an induced current flows in a direction that ____ the action that produces it. | Opposes |
| Gamma rays are produced in the ____ of the atom. | Nucleus |
| Photons with the highest frequencies have the__ wavelengths | Shortest |
| The degree to which a material can be magnetized is: | Magnetic susceptibility |
| The charges on an electrified object (like a cloud) are distributed | Evenly throughout the object. |
| What is the SI unit of magnetic field strength? | Tesla |
| A transformer 'transforms" or changes electric: | Voltage |
| A step up transformer has 50 coils on the primary side and 3000 coils on the secondary side. What is the turns ratio? | 60:1 |
| --I>l-- is symbol for what? | Diode |
Created by:
ktynes