In [4]:

```
#initiation of variable
Mn=1.008665;Mp=1.007276 #Given mass of an electron and a proton in terms of u
#calculation
Md= Mn-Mp; #mass difference
Md2=Md*931.50; #converting u into Mev/c^2 by multiplying by 931.5 MeV/c^2
#result
print "Mass difference in terms of U is",round(Md,4);
print"which equals in Mev/c^2. :",round(Md2,3);
```

In [5]:

```
#initiation of variable
Mp=1.007276 ; Me=5.4858*10**-4; #mass of proton and electron in terms of U
#calculation
Mt=Mp+Me; #Total mass= sum of above masses
#result
print"The combined mass of an electron and a proton was found out to be in U.",round(Mt,3);
```

In [8]:

```
#initiation of variable
h=6.621*10**-34 ; c=2.9979*10**8; # h is in J/s and c is in m/s
hc=h*c*((10**9)/(1.6022*10**-19)); #1e=1.602*10^-19 J and 1 m=10^9 nm
#result
print "The value of hc in eV.nm is",round(hc,4);
print 'Hence zero at the end is significant.';
```