Question

Arrange the electromagnetic radiations $a , b , c , d$ and $e$ in increasing order of energy. Frequencies of $a , b$ and $c$ are $10^{15}, 10^{14}$ and $10^{17}$ respectively whereas wavelength of $( d )$ and $( e )$ are $350 \,nm$ and $100\, nm$ respectively ?

• A. a, b, c, d, e
• B. a, b, d, e, c
• C. a, d, b, e, c
• D. b, d, a, e, c

Answer 1

Answer: (D)

$E= hv$
and $v=\left(\frac{c}{\lambda}\right)$
$v_{ a } =10^{15}, v_b=10^{14}, $
$v_c =10^{17}, v_d=0.85 \times 10^{15}$
and $v_e =10 \times 10^{15}$