Final answer:
To find the frequency of a radiation, you can use the equation f = c/λ, where f is the frequency, c is the speed of light, and λ is the wavelength. Then you can use the wavelength to find the time it takes for the X-rays to travel a certain distance.
Step-by-step explanation:
To find the frequency of a radiation, you can use the equation f = c/λ, where f is the frequency, c is the speed of light, and λ is the wavelength. In the case of X-rays with a frequency of 3×10¹⁸ Hz, you can use this equation to calculate the wavelength first. Then you can use the wavelength to find the time it takes for the X-rays to travel a certain distance.
For example, to find the time it takes for the X-rays of frequency 3×10¹⁸ Hz to travel 1 mm, you would first calculate the wavelength using λ = c/f. Once you have the wavelength, you can use the equation velocity = distance/time to find the time it takes. This equation rearranges to time = distance/velocity, where distance is 1 mm and velocity is the speed of light.
Using the same process, you can find the time it takes for the X-rays to travel 1 cm.