Which of the following types of waves needs a medium for ...
Which of the following types of waves needs a medium for propagation?
sound waves
light waves
radio waves
x - rays
Correct answer is A
Sound is the only mechanical wave among the rest which are electromagnetic waves.
The wave motion above has a frequency ...
In the fig above, XY is of length 1m, The value of R at balance point Z is ...
A radioactive isotope has a decay constant of 10-6s-1. Calculate its half - life?...
The major difference between a pure semiconductor and a pure metal is that ...
A boy cycles continuously through a distance of 1.0 km in 5 minutes. Calculate his average speed...