Wired Faculty
Sponsor Area
A wire of length 80 cm has a frequency of 256 Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz.
As the frequency (F) of wire is inversely proportional to its length (l)
So, for the same tension, we have, F1l1 = F2l2
Given, F1 = 256 Hz, F2 = 1024 Hz and
Hence, the length of wire, which has frequency 1024 Hz is 20 cm.
Sponsor Area
A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
1. Calculate the speed with which this sound travels
2. What difference would be felt by a listener between the above sound and another sound travelling at the same speed, but of wavelength 2.6 m?
1. Given, f = 256 Hz and λ = 1.3 m
We know that
Speed v = f x λ = 256 x 1.3
⇒ v = 332.8 m s-1
Thus, the sound travels with a speed of 332.8 m s-1.
2. For the second case, λ = 2.6 m and v = 332.8 m s-1 
Name the colour code of the wire which is connected to the metallic body of an appliance.
| Wire | ||
| Old Convention | New Convention | |
| Live wire | Red | Brown |
| Neutral wire | Black | Light blue |
| Earth wire | Green | Green or Yellow |
Draw the diagram of a dual control switch when the appliance is switched ‘ON’.
Which particles are responsible for current in conductors?
Free electrons are responsible for current in conductors.
Sponsor Area
Mock Test Series
