Waves & Oscillation
Two periodic waves of intensities I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is
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If λv,λr and λm represent the wavelength of visible light x-rays and microwaves respectively, then [CBSE PMT 2005]
A beam of natural light falls on a system of 6 polaroids, which are arranged in succession such that each polaroid is turned through 30° with respect to the preceding one. The percentage of incident intensity that passes through the system will be
In a single slit diffraction experiment first minimum for red light (660 nm) coincides with first maximum of some other wavelength l'. The value of l' is
Assertion : Microwave communication is preferred over optical communication. Reason : Microwaves provide large number of channels and band width compared to optical signals. [AIIMS 2003]
For skywave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere [AFMC 2005]
The speed of electromagnetic wave in vacuum depends upon the source of radiation [Kerala PMT 2004]
According to Maxwell?s hypothesis, a changing electric field gives rise to [AIIMS 1998]
Infrared radiation was discovered in 1800 by [KCET 2005]