Long Answer TypeThe diagram below shows the displacement time graph of a vibrating body.
i) Name the type of vibrations produced by the vibrating body.
ii) Give one example of a body producing such vibrations.
iii) Why is the amplitude of the wave gradually decreasing?
iv) What will happen to the vibrations of the body after some time?i) Damped vibrations.
ii) Tuning fork vibrating in air produces damped vibrations.
iii) Due to friction, energy is continuously lost. Hence, the amplitude of the wave is gradually decreasing.
iv) After some time, the amplitude gradually decreases and finally stops.
Three resistors are connected to a 6 V battery as shown in the figure given below: 
Calculate:
i) the equivalent resistance of the circuit.
ii) total current in the circuit.
iii) potential difference across the 7.2 ohm resistor
A certain nucleus X has a mass number 14 and atomic number 6. The nucleus X changes to 
after the loss of a particle.
i) Name the particle emitted.
ii) Represent this change in the form of a equation.
iii) A radioactive substance is oxidized. What change would you expect to take place in the nature of its radioactivity? Give a reason for your answer.
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