Transmission of Wave
What are galvanic and faradic currents?
- A1sin π(t+x3)
- A2sin π(t−k3+1)
- A2sin π(t+x3)
- A2cos π(t+x3)
Figure (15-E10) shows an aluminium wire of length 60 cm joined to a steel wire of length 80 cm and stretched between two fixed supports. The tension produced is 40 N. The cross-selectional area of the steel wire is 1.0 mm2 and that of the aluminium wire is 3.0 mm2. What could be the minimum frequency of a tuning fork which can produce standing waves in the system with the joint as a node ? The density of aluminium is 2.6 g cm−3 and that of steel is 7.8 g cm−3
During the propagation of electromagnetic waves in a medium,
Electric energy density is equal to the magnetic energy density.
Both electric and magnetic energy densities are zero.
Electric energy density is half of the magnetic energy density.
Electric energy density is double of the magnetic energy density.
Find the time taken by the pulse in travelling through a distance of 50 cm on the string. Take g=10 m/s2
- 0.04 s
- 0.03 s
- 0.05 s
Unit of energy density of electromagnetic wave is:
None of these
- 0.01 mm
- 0.3 mm
- 0.04 mm
- 0.02 mm
A steel wire has a length of 12.0 m and a mass of 2.10 kg. What should be the tension in the wire so that speed of a transverse wave on the wire equals the speed of sound in dry air at 20∘C=343ms−1
- The pulse will travel with uniform speed
- The pulse will travel with increasing speed
- The pulse will travel with decreasing speed
- The pulse cannot travel through the rope
- its frequency changes
- its wavelength does not change
- its amplitude may change
- its speed does not change
- All of these
- 77 m/s
- 102 m/s
- 110 m/s
- 165 m/s
A wave with amplitude travels on a long string of linear mass density kept under a tension of .
(a) Find the average power transmitted across a given point on the string.
(b) Find the total energy associated with the wave in a long portion of the string.
[Assume, tension in both the strings is same]
- Cannot be predicted
The waves used for line-of-sight (LOS communication) is
- 70 dB
- 80 dB
- 75 dB
- 72 dB
For this situation two statements are given below
(i)The reflected pulse will be in same orientation of incident pulse due to a phase change of π radians
(ii) During reflection the wall exert a force on string upward direction.
For the above given two statements, choose the correct option given below.
- Both are wrong
- Only (i) is true
- Only (ii) is true
- Both are true