Physics Electromagnetic Waves Level: High School
At a given instant in time , a traveling EM wave is noted to have its maximum magnetic field pointing west and its maximum electric field pointing south .In which direction is the wave traveling ?
(a) downward
(b) upward
If the rate of energy flow is 2.30E2 W/m2 , what is the maximum value for the Electric field ?
What is the maximum value for the Magnetic field ?
Physics Electromagnetic Waves Level: High School
A high energy pulsed laser emits a 1.5 ns long pulse of average power 1.8E 11W . The beam is 1.7 E-3 m in radius .Determine the energy delivered in each pulse .
Determine the rms value of the electric field .
Physics Electromagnetic Waves Level: High School
The amplitude of the B field of an EM wave is 2.3 E-7T .What is the amplitude of the E field ?
What is the average power per unit area of the EM wave ?
Physics Electromagnetic Waves Level: High School
A 10.7 mW laser puts out a narrow beam 1.50 mm in diameter.What is the average (rms) value of E in the beam ?
What is the average (rms) value of B in the beam ?
Physics Electromagnetic Waves Level: High School
How much energy is transported across a 1.00-cm2 area per hour by an EM wave whose E field has an rms strength of 58.6 mV/m ?
Physics Electromagnetic Waves Level: High School
Pulsed lasers used for science and medicine produce very short brusts of electromagnetic energy . The laser light wavelength is 1095 nm and the pulse lasts for 20 picoseconds .How many wavelengths are found within the laser pulse ?
How short would the pulse need to be to fit only one wavelength ?
Physics Electromagnetic Waves Level: High School
A nearby star is 5.8 light away . How far away is it in meters ?
Physics Electromagnetic Waves Level: High School
What is the wavelength of a 2.757 E 10 Hz radar signal ?
Physics Electromagnetic Waves Level: High School
If the magnetic field in a traveling EM wave has a peak value of 12.5 nT , What is the peak value of the electric field strength ? 3 .
Physics Electromagnetic Waves Level: High School
A white light is placed near a prism . The resulting light ‘bounces’ off a mirror onto an opposite wall . Describe the initial state versus the final state of the light and changes it undergoes between these two states . What is the difference between what the light looks like on the mirror versus what it looks like on the opposite wall ?
Physics Electromagnetic Waves Level: High School
A certain electromagnetic wave (em) has a period of 1 x 10^-21 s . What is the wave’s frequency and wavelength ? What type of an em is this ?
Physics Electromagnetic Waves Level: High School
Suppose you take a coil of wire and you could measure any current passing through it . You now wave the coil around in the air and even though there are no magnets nearby you detect a current in the wire . What causes this current .
Physics Electromagnetic Waves Level: High School
Suppose an electric charge is sitting out in space by itself and not moving . What happens when an electromagnetic wave passes through the space around this charge ?
Physics Electromagnetic Waves Level: High School
What some radiation harmful and some not harmful , for instance the visible light given off by a light bulb is an electromagnetic wave but will not harm your body , but an xray is also an electromagnetic wave but can be harmful to your body ?
Physics Electromagnetic Waves Level: High School
A powerplant produces a certain amount of power at a certain voltage , the power is ‘stepped up’ to a much higher voltage for transmission over long distances using a transformer then ‘stepped down’ to a lower voltage before it enters your home . What is the purpose of this procedure ?