Exam 8: Electromagnetism and Em Waves

For a body emitting blackbody radiation,the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters,T in kelvins) Assume an object is emitting blackbody radiation. -A body in a room at 300 K is heated to 3,000 K.The wavelength of the most intense EM radiation emitted by the body at 3,000 K is the wavelength of the most intense EM radiation at 300 K.

For a body emitting blackbody radiation,the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters,T in kelvins) Assume an object is emitting blackbody radiation. -If the Kelvin temperature of a body is doubled,the wavelength of the most intense light is double the wavelength originally of the most intense light.

The cosmic background radiation

__________ are emitted when high speed electrons decelerate as they are smashed into a metal target.

One can reverse the north and south poles of an electromagnet by reversing the direction of current flow through it.

AM radio stations have greater range than FM stations because they have more powerful transmitters.

There are positive and negative magnetic charges,analogous to positive and negative electric charges.

TV remote controls use ________ radiation.

​Match each item with the correct statement below. -radar utilizes this

What does "IR" stand for?

The radio waves used to communicate with astronauts in space must be ___________ frequency waves.

What makes an ordinary bar magnet magnetic?

Moving electric charges make magnetic fields.

An electric motor can be manually turned and made to act as a generator.

A magnetic field is created by an electric charge if the charge is

FM radio only operates in the frequency range 88 MHz to 108 MHz because

​Match each item with the correct statement below. -absorbs ultraviolet light in sunlight

An iron nail is brought near a magnet.Which of these is not true?

The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is 300 meters.

The magnetic compass in an aircraft points to the geographic North Pole.