An object placed 15cm from a converging lens forms a real image whose magnification is 2.0. What is the focal length of the lens?

What is the energy stored in a 10μ F capacitor if the potential difference between the plates is 40 V?

Totally reflecting prisms are preferred to mirrors in periscopes because I. mirror givegive multiple images II. silvering on mirrors is easy damaged III. mir...

The invisible part of the spectrum of white light consists of

Which scientist discovered natural radioactivity?

What is X in the equation given below? 42He + 94Be → 126C + X

50cm3 of air at a pressure of 5Nm-2 is enclosed in a metal tube by a piston. If the piston is pushed in a distance of 10cm, what will the pressure of the air...

A waterfall is 630m high. What is the change in temperature of a quantity of water that falls from the top to the bottom of the waterfall? (Neglect heat loss...

Notes of the same frequency sounded on a piano and on a flute may differ in I. pitch II. quality III. Loudness