Light of wavelength 2000 ˙A falls on a metallic surface whose work function is 4.2 eV. Calculate the stopping potential. (hc=12400 eV˙A)
12 V
2 V
3 V
6 V
Let Z be the set of all integers.
A={(x,y)∈Z×Z:(x−2)2+y2≤4},
B={(x,y)∈Z×Z:x2+y2≤4} and
C={(x,y)∈Z×Z:(x−2)2+(y2−2)2≤4}
If the total number of relations from A∩B to A∩C is 2p, then the value of p is
16
49
25
9