Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation.
The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 ms-1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range.
An enemy plane is at a distance of 300 km from a radar. In how much time the radar will be able to detect the plane? Take velocity of radio waves as x 108 ms-1.
How is the frequency of a stretched string related to:
(i) it’s length
(ii) it’s tension?
Define specific resistance and state its SI unit.
Specific resistance or resistivity (ρ), of a conductor, is defined as the resistance of a conductor of unit length and unit area of cross-section.
From the factors affecting the resistance of a conductor, the resistance is given by,
Its SI unit is ohm-m
Specific resistance or resistivity is the characteristic property of the material of the conductor and depends only on the nature of the material and temperature.
An electric bulb of 300 Ω draws a current of 0.4 A. Calculate the power of the bulb and the potential difference at its ends.