What is the difference between a lens and a mirror?
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How is radiation emitted from the body?
which electronic devices used at low frequencies? and high frequencies?and microwave frequencies?
Explain what is the homogenous?
Explain diffraction?
How is sound produced?
what is the importance of frequency?
What evidence is there supporting the big bang theory?
does plane mirror produce real image?how?
Why is it possible to see the face through a glass, ehen it is polished from on side ?
What is moment of inertia?
What is a Pressure ?
What are the steps to the scientific notation?