Question

Match the following

Column -I	Column -II
i) X-rays	a) v = $1 \cdot 10^4$ Hz
ii) UV	b) v = $10^{10}$ Hz
iii) Long radio waves	c) v = $10^{16}$ Hz
iv) Microwave	d) v = $10^{18}$ Hz

• A. i-c, ii-d, iii-a, iv-e
• B. i-b, ii-d, iii-a, iv-c
• C. i-c, ii-e, iii-a, iv-d
• D. i-d, ii-c, iii-a, iv-b

Answer 1

Answer: (D)

i-d, ii-c, iii-a, iv-b

Answer 2

1. Recall the approximate frequency ranges for different types of electromagnetic waves:
   • Long radio waves: typically $10^4 \text{ Hz}$ to $10^6 \text{ Hz}$.
   • Microwaves: typically $3 \times 10^8 \text{ Hz}$ to $3 \times 10^{11} \text{ Hz}$.
   • Ultraviolet (UV) rays: typically $7.5 \times 10^{14} \text{ Hz}$ to $3 \times 10^{16} \text{ Hz}$.
   • X-rays: typically $3 \times 10^{16} \text{ Hz}$ to $3 \times 10^{19} \text{ Hz}$.
2. Match the given wave types with the frequencies provided in Column-II:
   • i) X-rays: The frequency $10^{18} \text{ Hz}$ (d) falls within the X-ray range.
   • ii) UV: The frequency $10^{16} \text{ Hz}$ (c) falls within the UV range (at its upper limit).
   • iii) Long radio waves: The frequency $1 \cdot 10^4 \text{ Hz}$ (a) falls within the long radio wave range.
   • iv) Microwave: The frequency $10^{10} \text{ Hz}$ (b) falls within the microwave range.
3. The correct matching is i-d, ii-c, iii-a, iv-b.