Bandwidth of Channels

Q. When a train is approaching the observer, the frequency of the whisle is 100cps, while when it has passed the observer, it is 50cps. Calculate the frequency when the observer moves with the train

Q.

Range of frequencies allotted for commercial FM radio broadcast is

1. 88 to 108 MHz

2. 88 to 108 kHz

3. 8 to 88 MHz

4. 88 to 108 GHz

Q. A telephone link operating at a central frequency of 10 GHz is established. If 1% of this is available then how many telephone channel can be simultaneously given when each telephone covering a band width of 5 kHz

1. 2 $\times {10}^4$
2. 2 $\times {10}^6$
3. 5 $\times {10}^4$
4. 5 $\times {10}^6$

Q. For television broadcasting, the frequency employed is normally

Q. Solve this :

16. An organ pie s closed at one end has fundamental frequency of 1500 Hz. Find maximum number overtones generated by this pipe which a normal person can hear.

(1) 14 (2) 13
(3) 6 (4) 9