The energy of the photon with a frequency of 3×10¹⁵ Hz is :

1. 1.988 × ${10}^{-18}$ J
2. 1.588 × ${10}^{-18}$ J
3. 1.288 × ${10}^{-18}$ J
4. 2.988 × ${10}^{-18}$ J

The energies E₁ and E₂ of two radiations are 25 eV and 50 eV respectively. The relation

between their wavelengths ( λ₁ and λ₂ ) will be -

1. λ₁ = 2λ₂

2. λ₁ = 4λ₂ 

3. λ₁ = $\frac{1}{2}$λ₂

4. λ₁ = λ₂

Match the following:

The correct arrangement of the following electromagnetic spectrum in the increasing order of frequency is:

Photons of wavelength 4000  $A^o$ are used to break ${\mathrm{l}}_2$ molecules. The percentage of energy converted to the kinetic energy of atoms will be :

(bond dissociation energy of the molecule is 246.5 kJ/mol)

1.  12%

2.  8%

3.  26%

4.  17%

The neon gas emits radiation of 616 nm. The number of quanta that are present in 2 J of energy is:

$1.$ $6.2$ $\times$ ${10}^{-18}$
$2.$ $5.6$ $\times$ ${10}^{17}$
$3.$ $6.2$ $\times$ ${10}^{18}$
$4.$ $32.2$ $\times$ ${10}^{-20}$
$$