The energy of an electrmagnetic radiation is 19.875 × 10−13 erg. What is the wave number in cm−1? h = 6.625 × 10−27 erg.Sec; c = 3 × 1010cm.sec−1
1000
106
100
10,000
¯¯¯v = Ehc = 19.895 × 10−136.625 × 10−27 × 3 × 1010
= 10,000
The energy of a photon is 3 × 10−12 ergs. What is its wavelength in nm ? (h = 6.62 × 10−27 erg.Sec; c = 3 × 1010cm.s−1)