WorksheetsPHYSICS SELF STUDY
Total questions: 15
Worksheet time: 7mins
what are the types of electromagnetic waves?
radio waves
microwaves
carrier wave
x rays
A ------------ is a device that converts voice, music,
pictures, or data to electronic signals, amplifies the
signals, and then sends the signals to an antenna.
(a)
Some applications of EM in our real life
cancer treatment
cars
GPS
Cellular phones
The ----------- creates the electromagnetic waves
that propagate through the air.
(a)
EM waves are composed of resting magnetic and electric fields.
TRUE
FALSE
A specific wavelength in the radio part of the electromagnetic spectrum that is assigned to a radio station is called the station’s ---------------.
(a)
Metallic or conductive materials are great reflectors, although almost any surface can reflect the waves and interfere with other radio frequency waves.
TRUE
FALSE
What is a transmitter composed of?
Bulb
antenna
oscillator
lens
amplifier
A station broadcasts information by varying its carrier wave using a receiver
TRUE
FALSE
when producing EM, why do the oscillations in a coil and capacitor die out over time ?
due to the materials worsening overtime
due to the energy being propagated in the electromagnetic wave
due to resistance in the circuit.
RECEIVING ELECTROMAGNETIC WAVES: The acceleration is largest when the antenna is -----------to the direction of the wave’s electric field.
(a)
Antennas capture electromagnetic waves, converting the waves’ oscillating electric fields back to ----------------
(a)
The size of the resonant cavity determines the frequency of oscillation.
TRUE
FALSE
In order to produce waves with frequencies higher than 100 GHz, what has to be done?
a resonant cavity would have to be reduced to molecular size.
a resonant cavity would have to be reduced to atomic size.
a resonant cavity would have to be increased in size.
Properties of electromagnetic waves
The EM waves travel in 3x10^8 m/s
waves oscillate in proportional planes
transfers waves
it can not move in vacuum
