Chemistry-
General
Easy
Question
Bombardment of aluminium by 
particle leads to its artificial disintegration in two ways, (i) and (ii) as shown. Products 
and 
respectively are
- Proton, neutron, positron
- Neutron, positron, proton
- Proton, positron, neutron
- Positron, proton, neutron
The correct answer is: Proton, neutron, positron
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Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. If the wavelength received by enemy ship is 
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Physics-General
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Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. The velocity of enemy ship should be :
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Physics-General
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