Physics
The light rays used for eliminating bacteria

X-rays
Ultra-violet radiation
Microwave radiation
Infrared rays

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Physics
Which of the following events occurred first ?

Max Planck unveiled the Quantum Theory
Albert Einstein propounded the General Theory of Relativity
Marconi first tranmitted a wireless signal
Madame Marie Curie became the first woman Nobel Prize winner

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Physics
A standing wave occurs when

A wave reflects upon itself
The speed of the wave is zero or near zero
Two waves overlap
The amplitude of a wave exceeds its wavelength

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