# NEET Questions Solved

NEET - 2015

The energy of the EM wave is of the order of 15 KeV. To which part of the spectrum does it belong?

(a)X-rays

(b)Infrared rays

(c)Ultraviolet rays

(d)$\gamma$-rays

Given energy of EM waves is of the order of 15keV
i.e. E=hv=h x $\frac{c}{\lambda }$

=>λ=

=6.624x10-34 x 3x1018/15 x 10x 1.6x10-19

=1.3248 x 10-29/1.6x10-19

=0.828x10-10m

=0.828Å [∴1Å=10-10m]

λ=0.828Å

Thus, this spectrum is a part of X-rays.

Difficulty Level:

• 29%
• 28%
• 29%
• 16%