7477

Physics Electromagnetic Waves Level: Misc Level

The amplitude of the elecric field component of an electromagnetic wave is increased from E to 4 E. 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


5076

Physics Electromagnetic Waves Level: Misc Level

Show that the crests of a wave psi =Asin ( ax -bt ) move to the right at a speed v equal to the ration of the coefficients of t and x: that is v =b /a.


5071

Physics Electromagnetic Waves Level: Misc Level

Why is light sometimes described as rays and sometimes as waves


4964

Physics Electromagnetic Waves Level: Misc Level

A popular FM radio station broadcasts at 100 MHz. Calculate the wavelength of this frequency.


4963

Physics Electromagnetic Waves Level: Misc Level

Calculate the frequency of a 1.77 Angstrom x-ray photon.


4962

Physics Electromagnetic Waves Level: Misc Level

Calculate the frequency of ultraviolet -blue light, which has a wavelength of 350 nanometers.

Formula C=speed of light V= Frequency 350 nanometers =Wavelength


4727

Physics Electromagnetic Waves Level: Misc Level

Treat each of your eyes as a circular aperture of diameter 3.5 m m. Light of wavelength 500 n m is used to view two point sources that are 114 m distant from you. How far apart must these two point sources be if they are just resolved by your eye? Assume that the resolution is diffraction limited, use Rayleigh s criterion.


4726

Physics Electromagnetic Waves Level: Misc Level

Unpolarized light in incident on the first of two polarizers with an intensity I (max).The light intensity after passing through the second polarizer is found to be 13% I (max).What is the angle between the two polarizers?


4725

Physics Electromagnetic Waves Level: Misc Level

A soap film is 130 n m thick. What is the shortest wavelength of visible light that will produce constructive interference in the film? The index of refraction of the soap is 1.33 and there is air on the other side.


4724

Physics Electromagnetic Waves Level: Misc Level

A single slit 2.1 mm wide is illuminated by light of wavelength 505 n m . A diffraction pattern is seen on a screen 3.0 m from the slit. What is the linear distance on the screen between the first two diffraction minima on either side of the central max?


4723

Physics Electromagnetic Waves Level: Misc Level

Light of wavelength 431 n m passes through two slits.In the resulting interference pattern on a screen 3.9 m away, adjacent bright fringes are separated by 2.7 m m. What is the separation of the two slits?


4520

Physics Electromagnetic Waves Level: Misc Level

An object appears yellow if it reflects red and green light. An object appears magenta if it reflects red and blue light. Imagine you are wearing a yellow shirt and a magenta hat. if you go into a in which your magenta hat appears blue and your yellow shirt appears black. What color is the light in the room?


4473

Physics Electromagnetic Waves Level: Misc Level

A. 3400 line / cm grating produces a third order fring at a 28.0 degrees. What wavelength of is being used?


4471

Physics Electromagnetic Waves Level: Misc Level

Light of wavelenth 730 nm passess through a slit of 1.0 x 10 -3 mm wide. How wide is the central maximum in degrees?


4440

Physics Electromagnetic Waves Level: Misc Level

A black body at 0 C has a surface area of 35 cm squared. Determine the rate at which energy is emitted by the object.


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