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+clc;clear;
+//Example 5.7
+
+//given values
+f=1*10^12;//frequency in Hz
+h=6.625*10^-34;//Plank's constant
+
+//calculation
+E=h*f;
+n=E/6.625;
+disp(n,'the no. of photons required')
+\ No newline at end of file