Radio frequency choke is air cored, whereas as audio frequency choke is iron cored, Explain.

Radio frequency choke has core of

Radio frequency choke is stored to

In modulation process, radio frequency wave is termed as:

A train,standing at the outersignal of a railway station blows a whistle of frequency 400 Hz in still air. What is the frequency of the whistle for a platform observer when the train. recedes from the platform with a speed of 10 m s^-1 ?

A train,standing at the outersignal of a railway station blows a whistle of frequency 400 Hz in still air. What is the frequency of the whistle for a platform observer when the train approaches the platform with a speed of 10 m s^-1

A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, will the current increase or decrease ? Explain.

When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency. Explain, why.

A copper coil L wound on a soft iron core and a 15 W - 110 V lamp are connected to a 30 V battery through a tapping key as shown in the figure. When the key is closed, the lamp glows dimly. But when the key is suddenly opend, the lamp flashes for an instant to much greater brightness. Explain, why.