Question

Hydrogen atom emits blue light when it changes from n = 4 energy level to the n = 2 level. Which colour of light would the atom emit when it changes from the n = 5 level to the n = 2 level

(a) Red

(b) Yellow

(c) Green   

(d) Violet

Answer

(d) Violet

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

If proton moves with velocity $10 \hat{i} m / s ^{-1}$ in magnetic field having magnitude $5 \hat{j}$ T. magnetic force acting on it is __________ N .
A point source of light is used in a photoelectric effect. If the source is removed farther from the emitting metal, the stopping potential:
With increase in temperature the conductivity of:
Materials which allow only larger currents to flow through them are:

On increasing the temperature of a conductor, its resistance increases because

(a) Relaxation time decreases

(b) Mass of the electrons increases

(c) Electron density decreases

(d) None of the above

According to Maxwell , most of the optical properties of light depend on:
A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle:
  1. Does not deflect.
  2. Deflects for a very short time and then comes back to the original position.
  3. Deflects and remains deflected as long as the battery is connected.
  4. Deflects and gradually comes to the original position in a time that is large compared to the time constant.

The absorption transitions between the first and the fourth energy states of hydrogen atom are 3. The emission transitions between these states will be    

(a) 3 

(b) 4

(c) 5  

(d) 6

A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle q, the reflected light will deviate from its original path by the angle

(a) 2θ

(b) 0°

(c)  θ

(d) 4θ

The material of fuse wire should have

(a) A high specific resistance and high melting point

(b) A low specific resistance and low melting point

(c) A high specific resistance and low melting point

(d) A low specific resistance and a high melting point