NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1225  1228 of 2320
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Question number: 1225
» Wave Optics » Young's Double Slit Experiment
Question
In Young’s double slit experiment, white light is used. The separation between the slits is b. The screen is at a distance d (d > > b) from the slits. Some wavelengths are missing exactly in front of one slit. One of these wavelengths is
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 1226
» Properties of Solids & Liquids » Latent Heat
Question
A lead bullet at 25°C just n tits when stopped by an obstacle. Assuming that 25 % of heat is absorbed by the obstacle, then the velocity of the bullet at the time of striking (M. P. of lead = 320°C, specific heat of lead = 0.02 cal/gm°C, latent heat of fusion of lead = 6 cal/gm and J = 4.2 joule/cal)
Choices
Choice (4)  Response  

a.  307.5 m/sec  
b.  4.010 m/sec  
c.  0.365 m/sec  
d.  Question does not provide sufficient data or is vague 
Question number: 1227
» Wave Optics » Huygens' Principle
Question
In an interference pattern, at a point we observe the 16 ^{th} order maximum for λ _{1} = 6000A. What order will be visible here if the source is replaced by light of wavelength? λ _{2} = 4800 Å
Choices
Choice (4)  Response  

a.  10  
b.  20  
c.  40  
d.  80 
Question number: 1228
Question
Two Polaroids are oriented with their planes perpendicular to incident light and transmission axis making an angle of 30 ^{0} with each other. What fraction of incident unpolarised light is transmitted?
Choices
Choice (4)  Response  

a.  17.5 %  
b.  27.5 %  
c.  37.5 %  
d.  57.5 % 