MCQ
The frequency of light ray having the wavelength $3000 \mathring A$ is
- A$9 \times 10^{13}$ cycles $/ \mathrm{sec}$
- ✓$10^{15}$ cycles $/ \mathrm{sec}$
- C$90$ cycles $/ \mathrm{sec}$
- D$3000$ cycles $/ \mathrm{sec}$
✓
Answer
Correct option: B.
$10^{15}$ cycles $/ \mathrm{sec}$
$10^{15}$ cycles $/ \mathrm{sec}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Equipotential surfaces:
The dispersive power is maximum for the material(a) Flint glass(b) Crown glass(c) Mixture of both(d) None of the above
In an endothermic reaction the binding energies of reactants and products are $e_{1}, e_2$ respectively, then:
→Bonds in semiconductors are :
Which of one is correct
A star emitting radiation at a wavelength of $5000 \mathring A$ is approaching earth with a velocity of $1.5 \times10^6 m/s$. The change in wavelength of the radiation as received on the earth, is
→The antiparticle of electron is:
The ratio of the speed of the electrons in the ground state of hydrogen to the speed of light in vacuum is(a) 1/2 (b) 2/137(c) 1/137 (d) 1/237
A conducting ring is placed around the core of an electromagnet as shown in fig. When key $K$ is pressed, the ring
→ A 20cm long capillary tube is dipped in water. The water rises up to 8cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be:
- 8cm
- 6cm
- 10cm
- 20cm