The element of the heater is very hot while the wire carrying current is not. Why?
Is there any difference between resistance of a wire and resistivity of a wire?
What is a polarizing angle? Does polarizing angle depend on the light used?
Write the structure and functions of the Hydathode with a labeled diagram.
The radius of curvature of the curved mirror is 200 m and the plane mirror is rotated at 20 rev/s. Calculate the angles in degree between the ray incidents on the plane mirror and then reflected from it after the light has traveled to the curved mirror and back to the plane mirror. (c = 3 x 10^8 m/s).
What is the difference between plane wavefront and the spherical wavefront?
Define intensity of a sound. Show that the intensity of a sound for a given frequency is directly proportional to the square of amplitude of the vibration.
An empty vessel sounds more than a filled one when it is struck. Why?
A wire having a diameter of 0.90 mm is replaced by another wire of the same material but with a diameter of 0.93 mm. If the tension of the wire is as before what is the percent change in the frequency of fundamental note?
Describe an experiment with the necessary theory by which the speed of sound in air is determined by using the resonance tube method.
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