Find the wavelength of electromagnetic waves of frequecies `4 xx 10^(17)` Hz in free space.Give its two applications.

Explanation

Wavelength `=lamda=?`
Frequency `=v=4xx10^(17)` Hz
Velocity of electromagnetic waves
`=C=3xx10^(8)` m/s
`C=lamdav`
`lamda=(C)/(v)`
`lamda=(3xx10^(8))/(4xx10^(17))`
`lamda=0*75xx10^(-9)m`
`lamda=0*75` nm
Applications : See Very Short Answer Type Question No. 13 (1 Mark).