Energy associated with the first orbit of He+ is

Question

Energy associated with the first orbit of He+ is (A)  8.72 × 10-18 joules  (B)  0.872 × 10-18 joules  (C)  -0.872 × 10-18 joules  (D)  -8.72 × 10-18 joules

Tardigrade Admin · Accepted Answer

For H-like particles, En = (-21.78 × 10-19/n2) Z2 J = (-21.78 ×10-19/12) ×(2)2 = - 8.712 ×10-18 J

Q. Energy associated with the first orbit of $H e^{+}$ is

$8.72 \times 1 0^{- 18} j o u l es$

$0.872 \times 1 0^{- 18} j o u l es$

$- 0.872 \times 1 0^{- 18} j o u l es$

$- 8.72 \times 1 0^{- 18} j o u l es$

For H-like particles,
$E_{n} = \frac{- 21.78 \times 1 0 ^{- 19}}{n ^{2}} Z^{2} J$
$= \frac{- 21.78 \times 1 0 ^{- 19}}{1 ^{2}} \times (2)^{2} = - 8.712 \times 1 0^{- 18} J$

Q. Energy associated with the first orbit of He+ is

8.72×10−18joules

0.872×10−18joules

−0.872×10−18joules

−8.72×10−18joules