Ray Optics and Optical Instruments - Result Question 17
17. Wavelength of light of frequency $100 Hz$ [1999]
(a) $2 \times 16^{6} m$
(b) $3 \times 10^{6} m$
(c) $4 \times 10^{6} m$
(d) $5 \times 10^{6} m$
Show Answer
Answer:
Correct Answer: 17. (b)
Solution:
- (b) Frequency $(n)=100 Hz$
$v=n \lambda$
$\lambda=\frac{3 \times 10^{8}}{100}$
[where, velocity of light $(v)=3 \times 10^{8} m / s$ ]
$\lambda=3 \times 10^{6} m$.
