(a) White light (sunlight) is a combination of seven colours namely violet, indigo, blue, green, yellow, orange, red.
(b) This is because of the splitting of light into series of colour bands.
(c) \(E=\frac { hc }{ \lambda } ={ R }_{ H }{ Z }^{ 2 }\left( \frac { 1 }{ { n }_{ 1 }^{ 2 } } -\frac { 1 }{ { n }_{ 2 }^{ 2 } } \right) \)  
For H-atom, Z = 1, n₁ = 2 and n₂ = 4
\(=\frac { 6.63\times { 10 }^{ -34 }\times 3\times { 10 }^{ 8 } }{ \lambda }\)
\(=2.18\times { 10 }^{ -18 }\times { \left( 1 \right) }^{ 2 }\left( \frac { 1 }{ { \left( 2 \right) }^{ 2 } } -\frac { 1 }{ { \left( 4 \right) }^{ 2 } } \right) \)
\(or \ \frac { 1 }{ \lambda } =\frac { 2.18\times { 10 }^{ -18 } }{ 6.63\times { 10 }^{ -34 }\times 3\times { 10 }^{ 8 } } \left( \frac { 3 }{ 16 } \right) \)  
\(=1.096\times { 10 }^{ 7 }\left( \frac { 3 }{ 16 } \right) { m }^{ -1 }\)
\(\therefore \lambda =\frac { 16\times { 1 }0^{ -7 } }{ 1.096\times 3 } =4.86\times { 1 }0^{ -7 }\)
\(or \ =486\times { 1 }0^{ -9 } \ = \ 486nm\)
(d) The values associated with Sheela's teacher are intelligence, care for students, knowledge and helpful.

(a) The missing thing is that "a moving microscopic object." Thus, the correct statement of Heisenberg's principle is that it is not possible to determine the exact position and velocity of a moving microscopic object simultaneously.
(b) Romi's father told him that car is a microscopic object and such instruments are available because of their large size, the photon are not capable to change their velocity.
(c) Romi's father was intelligent, knowledgeable and Romi was curious and intelligent but somewhat careless about studies.