सूर्य की किरणों की तीव्रता मापने वाले उपकरण को क्या कहते हैं?

What is the key component inside a decibel meter that helps detect sound pressure?

A seismograph is an instrument used to:

Which instrument is used to detect and record earthquakes?

Which instrument is used to measure atmospheric pressure?

Which instrument is specifically used to measure the density and test the purity of milk?

Which of the following statements is/are true for an electron microscope? A. It uses a beam of light for illumination. B. It uses a beam of electrons for illumination. C. It uses electromagnets for magnification. D. It uses glass lenses for magnification. Choose the correct answer from the options given below:

Who invented the electron microscope?

Who invented the barometer?