If the ratio of numbers of turns in secondary to primary coil is 1:4. calculate teh secondary voltage where primary voltage is 220v

The material that keeps its new shape after it is stretched is called?

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat