Electromagnetic Radiation

The value of Planck's constant is 6.63 \times 10^–34 Js. The speed of light is 3 \times 10¹⁷ nm s^–1. Which value is closest to the wavelength in nanometers of a quantum of light with a frequency of 6 \times 10¹⁵ s^–1?

1. 25
2. 50
3. 75
4. 10

A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is: [speed of light, $\mathrm{c}=3.0\backslash times{10}^8$ ${\mathrm{ms}}^{-1}$]

1.	2192 m	2.	21.92 cm
3.	219.3 m	4.	219.2 m