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111 Q) "Consider the following statements with reference to X-rays
I. They produce heat when absorbed by matter.
II. They are generated when fast moving electron strike a metal target.
III. They can penetrate through a thin sheet of aluminium.
Which of the following statements given above are correct?."
120 Q) Two identical piano wires have same fundamental frequency when kept under the same tension. What will happen if tension of one of the wires id slightly increased and both the wires are made to vibrate simultaneously?.