Physics Electromagnetic Waves Level: Misc Level
A ray of light passes from one medium to another. The angle between the path of the ray in the second medium and the normal is the angle of?
Deviation, incidence, reflection, refraction
Physics Electromagnetic Waves Level: Misc Level
At what distance from a light rated at 160 Candelas would there be an illumination of 0.1 ft -c. ?
4 ft, 16 ft, 40 ft, or 127 ft
Physics Electromagnetic Waves Level: Misc Level
A light meter placed 4 ft. from a lamp rated at 70 candelas will indicate an illumination of?
A. 4.375 ft-c
B. 17.5 ft-c
C. 280 ft-c
D. 1120 ft-c
Physics Electromagnetic Waves Level: Misc Level
The radio" FM " means?
Field modulation.
Florilegium modulation
Frequency modulation
Force modulation
Physics Electromagnetic Waves Level: Misc Level
A body through which light passes almost undisturbed is called?
Physics Electromagnetic Waves Level: Misc Level
Astronomers find that light emitted by a particular element at one edge of the Sun has a slightly higher frequency than light from that element at the opposite edge. What do these measurements tell us about the Sun's motion?
Physics Electromagnetic Waves Level: Misc Level
Calculate the transmission frequency of an FM station in which the wavelength is 3.0 m.
Physics Electromagnetic Waves Level: Misc Level
Calculate the wavelength of a beam of visible violet light.
Physics Electromagnetic Waves Level: Misc Level
What makes 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: Misc Level
The amplitude of the B field of an EM wave is 2.3 E- 7 T.
What is the amplitude of the E field?
what is the average power per unit area of the EM wave?
Physics Electromagnetic Waves Level: Misc Level
How much energy is transported across a 1.00 - cm 2 area per hour by an EM wave whose E field has an ms strength of 58.6 mV/m?
Physics Electromagnetic Waves Level: Misc Level
Pulsed lasers used for scince and medicine produce very short bursts 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: Misc Level
In a certain TV set, the electron beam is accelerated through a potential difference of 20,000 V. what is the shortest - wavelength x- ray emitted as the beam strikes the end of the picture tube?Fortunately, very little of this radiation can penetrate 0.5 cm of glass. Even thinner sheets of metal will effectively stop the x- radiation . Longer- wavelength x- rays are much more easily stopped.
Physics Electromagnetic Waves Level: University
The amplitude of the electric field component of an electromagnetic wave is increased from E to 4E. What is the corresponding change in the intensity of the wave?(a) The intensity is unchanged by the increase in E
(b)The intensity increases by a factor of 16
(c) The intensity increases by a factor of 4
(d) The intensity decreases by a factor of 4
(e) The intensity decreases by a factor of 16
Physics Electromagnetic Waves Level: University
The amplitude of the electric field component of an electromagnetic wave is increased from E to 4E. What is the corresponding change in the intensity of the wave?(a) The intensity is unchanged by the increase in E
(b) The intensity increases by a factor of 16
(c) The intensity increases by a factor of 4
(d) The intensity decreases by a factor of 4
(e) The intensity decreases by a factor of 16`