NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1176  1180 of 2320
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Question number: 1176
» Dual Nature of Matter and Radiation » DeBroglie Relation
Question
A radio station is transmitting waves of wavelength 300 m. If diffracting power of transmitter is 10 kW, then numbers of photons diffracted per second is
Choices
Choice (4)  Response  

a.  1.5 × 10 ^{33}  
b.  1.5 × 10 ^{29}  
c.  1.5 × 10 ^{31}  
d.  1.5 × 10 ^{35} 
Question number: 1177
» Properties of Solids & Liquids » Heat Transfer » Radiation
Question
f between wavelength λ and λ + dλ, e _{λ} and a _{λ} be the emissive and absorptive powers of a body and E _{λ} be the emissive power of a perfectly black body, then according to Kirchhoff’s law, which is true
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 1178
» Properties of Solids & Liquids » Elastic Behavior
Question
The ratio of radii of two wires of same material is 2: 1. If these wires are stretched by equal forces, then the ratio of stresses produced in them will be
Choices
Choice (4)  Response  

a.  4: 1  
b.  1: 4  
c.  1: 2  
d.  2: 1 
Question number: 1179
» Dual Nature of Matter and Radiation » DeBroglie Relation
Question
In photoelectric effect if intensity of light is doubled then maximum kinetic energy of photoelectrons will become
Choices
Choice (4)  Response  

a.  No change  
b.  Four time  
c.  Double  
d.  Half 
Question number: 1180
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
A cylindrical rod with one end in a steam chamber and it other end in ice results in melting of 0.3 gm of ice per second. If the rod is replaced by another with half the length and double the radius of the first and if the thermal conductivity of material of second rod is that of first, the rate at which ice melts in gm/sec will be
Choices
Choice (4)  Response  

a.  0.1  
b.  0.2  
c.  3.2  
d.  0.6 