The energy of electro-magnetic radiation is 19-875 - 10-13 erg- What is its wave number in cm -1 h -6-625 - 10-27- erg - s - c -3 - -1010 cm - s -1A- 1000B- 106C- 100D- 10-000

The energy of a photon is $3 \times 10^{- 12} e r g s$ . What is its wavelength in nm ? ( $h$ = $6.62 \times 10^{- 27} e r g . S e c$ ; $c$ = $3 \times 10^{10} c m . s^{- 1})$

Q. A wave has a frequency of

3 \times 10^{15} S e c^{- 1}

.The energy of that photon is

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The energy of electro-magnetic radiation is 19.875×10−13 erg. What is its wave number in cm−1(h=6.625×10−27erg−s;c=3×1010cm.s−1)

The correct option is D 10,000E=hc¯v ¯v=Ehc=19.875×10−136.625×10−27×3×1010=104

The energy of electro-magnetic radiation is $19.875 \times 10^{- 13}$ erg. What is its wave number in $c m^{- 1} (h = 6.625 \times 10^{- 27} e r g - s; c = 3 \times 10^{10} c m . s^{- 1})$

The correct option is D 10,000
$E = h c ¯ v ¯ v = \frac{E}{h c} = \frac{19.875 \times 10^{- 13}}{6.625 \times 10^{- 27} \times 3 \times 10^{10}} = 10^{4}$