Refractive index of an optical medium changes with
Select the correct answer using the code given below :
Protons and neutrons are bound in a nucleus by the
Bases turn red litmus blue and acids turn blue litmus red. A student tested a liquid with a red litmus paper and it stayed red with no change. This shows that the liquid
Ultrasonic waves are those sound waves having frequency
The phenomenon of trade winds takes place due to
Which one among the following waves are called waves of heat energy?