MCQ
The energy of a photon of wavelength $\lambda$ is :
- Ahcλ
- ✓$h c / \lambda$
- C$h \lambda / c$
- D$\lambda / h c$
✓
Answer
Correct option: B.
$h c / \lambda$
B
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
The radius of hydrogen atom in its ground state is $5.3 \times 10^{-11}m.$ After collision with an electron it is found to have a radius of $21.2 \times 10^{-11}m.$ What is the principal quantum number $n$ of the final state of the atom
→An inductive coil has resistance of $100\Omega$ When an ac signal of frequency $1000 Hz$ is fed to the coil, the applied voltage leads the current by $45^\circ C.$ What is the inductance of the coil?
→Referring to the figure below, the effective resistance of the network is
Two charges $q_1$ and $q_2$ are placed in vacuum at a distance $d$ and the force acting between them is $F$. If a medium of dielectric constant $4$ is introduced around them, the force now will be
→The energy of a photon of a characteristic X-ray from a Coolidge tube comes from:
The time period of oscillation of a magnet in a vibration magnetometer is 1.5 sec. The time period of oscillation of another magnet similar in size, shape and mass but having 1/4 magnetic moment than that of the 1st magnet oscillating at the same place will be:
A force $'F\ ’$ is acting between two charges in air. If the space between them be completely filled with a medium $K = 4,$ the force will be:
→Figure shows three points $A, B$ and $C$ in a region of uniform electric field $\vec{E}$. The line $A B$ is perpendicular and $B C$ is parallel to the field lines. Then which of the following holds good. Where $V_A, V_B$ and $V_C$ represent the electric potential at points $A, B$ and $C$ respectively
→In an $NPN$ transistor circuit, the collector current is $10 mA$. If $90\%$ of the electrons emitted reach the collector, the emitter current $(i_E)$ and base current $(i_B)$ are given by
→A plane mirror is approaching you at a speed of 10 cm/sec You can see your image in it. At what speed will your image approach you (a) 10 cm/sec(b) 5 cm/sec(c) 20 cm/sec(d) 15 cm/sec