Question
Assertion : In Hertz experiment, the electric vector of radiation produced by the source gap is parallel to the gap.
Reason : Production of sparks between the detector gap is maximum when it is placed perpendicular to the source gap.

Answer

(c) Hertz experimentally observed that the production of spark between the detector gap is maximum when it is placed parallel to source gap. This means that the electric vector of radiation produced by the source gap is parallel to the two gaps i.e., in the direction perpendicular to the direction of propagation of the radiation.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Assertion : Work and heat are two equivalent form of energy.
Reason : Work is the transfer of mechanical energy irrespective of temperature difference, whereas heat is the transfer of thermal energy because of temperature difference only.
Assertion : The resistivity of a semiconductor increases with temperature.
Reason : The atoms of a semiconductor vibrate with larger amplitude at higher temperature there by increasing it's resistivity.
Assertion : The illuminance of an image produced by a convex lens is greater in the middle and less towards the edges.
Reason : The middle part of image is formed by undeflected rays while outer part by inclined rays.
Assertion : The bridges declared unsafe after a long use.
Reason : Elastic strength of bridges losses with time.
Assertion : The S.l. unit of thermal conductivity is watt $m K$
Reason : Thermal conductivity is a measure of ability of the material to allow the passage of heat through it.
Assertion : In the following circuit the potential drop across the resistance is zero.
Image
Reason : The given resistance has low value.
Assertion : A narrow pulse of light is sent through a medium. The pulse will retain its shape as it travels through the medium.
Reason : A narrow pulse is made of harmonic waves with a large range of wavelengths.
Assertion : The viscosity of liquid increases rapidly with rise of temperature.
Reason : Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion amongst its different layers
Assertion : In everyday life the Doppler's effect is observed readily for sound waves than light waves.
Reason : Velocity of light is greater than that of sound.
Assertion : In transistor common emitter mode as an amplifier is preferred over common base mode.
Reason : In common emitter mode the input signal is connected in series with the voltage applied to the base emitter function.