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echoes of extremely low frequency waves
ultraviolet rays
nuclear magnetic resonances
echoes of extremely high frequency waves
A double convex glass lens of focal length f and having a circular aperture is cut into two halves, each having a semicircular aperture. The focal length of each half is
A drop of liquid assumes spherical shape because
A dynamo is a device which
A dynamo is used to convert
A falling drop of rain water ac-quires the spherical shape due to
A falling drop of rain water acquires the spherical shape due to
A fixture is defined as a device which
A flat mirror has a minimum height to see a full reflection of a person.
A floating battery is one
A force of 12 N is applied to two packing cases on a frictionless horizontal surface as shown in figure. The force that each case exerts on the other is