Q.The Vividh Bharati Station of All India Radio, Delhi, broadcasts at a frequency of 1.368 kHz (kilo hertz). Calculate the wavelength of the electromagnetic radiation emitted by the transmitter. Which part of the electromagnetic spectrum does it belong to? OR The wavelength range of the visible spectrum extends from violet (400 nm) to red (750 nm). Express these wavelengths in frequencies (Hz). (1 nm = 10^-9 m)