Chlorophyll present in green leaves of plants absorbs light at 4.620 x 10¹⁴ Hz. Calculate the wavelength of radiation in nanometer. Which part of the electromagnetic spectrum does it belong to?

2

(a)

Wavelengths of different radiations are given below.
\(\lambda (A)=300\ nm,\ \lambda (B)=300\ \mu m,\ \lambda (C)=\ 3\ nm,\lambda (D)=30\overset { \circ }{ A } \)
Arrange these radiations in the increasing order of their energies.

2

(a)

Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculate the frequency (ν) and wavenumber (\(\bar { v } \)) of the yellow light.

2

(a)

Calculate the energy associated with the first orbit of He⁺. What is the radius of this orbit?

2

(a)

The unpaired electrons in Al and Si are present in 3p orbital. Which electrons will experience more effective nuclear charge from the nucleus ?

2

(a)