MCQ
Frequency of a wave is $6 \times {10^{15}}Hz.$ The wave is
- ARadiowave
- BMicrowave
- C$X-$ ray
- ✓None of these
$\lambda=\frac{c}{f}=\frac{3 \times 10^8}{6 \times 10^{15}}\,m$
$m \lambda=5 \times 10^{-8}\,m$
for, $10^{-8} m < \lambda < 10^{-11} m$ it is $x$-ray
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
| List $- I$ | List $- II$ |
| $(1)$ Rotation period of earth | $(i)$ $10^5\, s$ |
| $(2)$ Revolution period of earth | $(ii)$ $10^7\, s$ |
| $(3)$ Period of light wave | $(iii)$ $10^{-15}\, s$ |
| $(4)$ Period of sound wave | $(iv)$ $10^{-3}\, s$ |
$[\lambda$ is the radioactive decay constant]