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 ?
Physics Electromagnetic Waves Level: High School
An 80 kg astronaut has gone outside his space capsule to do some repair work. Unfortunately, he forgot to look his safety tether in space , and he has drifted 5.0 m away from the capsule . Fortunately , he has a 1000 W portable laser with fresh batteries that will operate it for 1.0 hr. His only chance is to accelerate himself toward the space capsule by firing the laser in the opposite direction. He has a 10-hr supply of oxygen .What time will it take the astronaut to reach the space capsule ?(Hours)
Physics Electromagnetic Waves Level: High School
A simple series circuit consists of a 200 ohm resistor , a 22.0 V battery , a switch , and a 3.50 pF parallel-plate capacitor (initially uncharged ) with plates 5.0 mm apart . The switch is closed at t = 0 s .After the switch is closed , find the maximum electric flux through the capacitor . (Vm) and the maximum displacement current through the capacitor ,(A)
Physics Electromagnetic Waves Level: High School
A 10-cm diameter parallel plate capacitor has a 1.00 mm spacing . The electric field between the plates is increasing at the rate 1.0 x 10^6 V/m/s . What is the magnetic field strength 3.0 cm from the axis ? (T)
Physics Relativity Level: High School
At what speed does a clock have to move in order to be seen to run at a rate that is one-half the rate of a clock at rest ?