A violet colour light have wavelength 380 nm . Find its frequency and

1.	A violet colour light have wavelength 380 nm . Find its frequency and energy
Answer» have given that wavelength = 380 nm .. convert it into m by multiplying 10 ^ -9 and then put the formula that frequency = c / wavelength [c is the speedof light in vaccum which is equal to 3 × 10 ^ 8 m/s ] then u will have ur frequency = 7.8 × 10 ^ 14 second inverse ... and then put the formula E = h × frequency [h = 6.626 × 10 ^ -34 J/s] and then simplify it u will have ur ans as 4.88 × 10 ^ -20 J.... So , frequency = 7.8 × 10 ^ 14 Hz Energy = 4.88 × 10^ -20 J

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