Related InterviewSolutions

• The all India Radio, station at Vijayawala transmits its signals at `840 K C//s`. The wave length of the radio wave isA. `35.7 m`B. `357 m`C. `35.7 m`D. `3.57 m`
• The displacement current was first postulated byA. AmpereB. MaxwellC. HertzD. Marconi
• The magnetic field In a travelling electromagnetic wave has a peak value of `20 n T ` The peak value of electric field strength is :A. `3 V//m`B. `6 V//m`C. `9 V//m`D. `12 V//m`
• An electromagnetic radiation of frequency v, wavelength `lamda`, travelling with velocity c in air, enters a glass slab of refractive index `mu`. The frequency, wavelength and velocity of light in the glass slab will be respectively.A. `(v)/(mu),(lamda)/(mu)` and `(c)/(mu)`B. `v,(lamda)/(mu)` and `(c)/(mu)`C. `v,2lamda` and `(c)/(mu)`D. `(2v)/(mu),(lamda)/(mu)` and c
• A lamp emits monochromatic green light uniformly in all directions. The lamp is `3%` efficient in converting electrical power to electromagnetic waves and consumes `100 W` of power. The amplitude of the electric field associated with the electromagnetic. radiation at a distance of `10 m` from the lamp will beA. `1.34V//m`B. `2.68 V//m`C. `5.36 V//m`D. `9.37 V//m`
• The magnetic field In a travelling electromagnetic wave has a peak value of `20 n T ` The peak value of electric field strength is :A. `6V//m`B. `9 V//m`C. `12 V//m`D. `3 V//m`
• Light with an energy flux of `18 W//cm^2` falls on a non-reflecting surface at normal incidence. If the surface has an area of `20 cm^2`, find the average force exerted on the surface during a `30` minute time span.
• The upper atmosphere layer is known asA. troposphereB. mesosphereC. ionosphereD. chromosphere
• Assertion: EM wave are transwers in nature. Reason: The electric and magnetic fields of an e.m. wave are perpendicular to each other also perpendicular to the direction of wave propagation.A. Statement-1 is true, statement-2, is true, statement-2 is a correct explanation for statement -1B. statement -1 is true, statement -2 is true, statement -2 is NOT a correct explanation for statement -1C. statement-1 is true , statement-2 is falseD. statement-1 is false, statement-2 is true
• In an electromagnetic wave in vacuum. The electrical and magnetic fields are `40piV//m` and `0.4xx10^(-7)T`. The poynting vectorA. `4.4 W m^(-1)`B. `0.44 W m^(-1)`C. `5.65 W m^(-1)`D. `4.0 W m^(-1)`