Which one of the following frequency of radiation (in Hz) has a wavelength of 600 nm

Which one of the folowing frequencies of radiation (in Hz) has a wavelength of 600 nm?

Which of the following electromagnetic radiation has largest wavelength?

What is the frequency of radiation of wavelenth 600 nm ?

Which of the following electromagnetic radiation has the smallest wavelength?

In which part of the electromagnetic spectrum, do the following radiations lie: (i) Having wavelength of 20 nm (ii) Having frequency of 10 MHz.