First voice signal was transmitted in the form of electrical signal in:
1870
1875
1876
1880
Which of the following devices can be used to produce both a transverse and longitudinal waves:
A string
A ripple tank
A helical spring (slinky)
A tuning fork
If the mass of the bob of a pendulum is increased by a factor of 3, the period of the pendulum’s motion will:
Be increased by a factor of 2
Remain the same
Be decreased by a factor of 2
Be decreased by factor of 4