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Clock Basics - III
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## Riya Agarwal is teaching live on Unacademy Plus

Riya Agarwal
The LRDI expert! 4+ years teaching experience. Your personal guide, use code "iriyaagarwal" for discount on plus subscription.

(3)
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Sir in the Q value of the beta plus decay how did we get the mass of 2 electron in the expression as there is no change in the constitution of electron when the beta plus decay occurs?
Udit Gupta
2 years ago
In beta plus decay, the elctron.masses do not cancel out each other because the reaction proceeds only when the Q value is positive. This tyoe of reaction can only proceed when mass of initial nucleus exceeds mass of final nucleus by atleast twice the mass of electron.
Priyansh Mehta
2 years ago
Ok got it sir...
I am not clear how the hands don't meet at 1.05? they should meet again at 2.10 and so on, making it 12 in 12 hours, right?
Prateek Suvarna
a year ago
The speed of minute hand is more than the hour hand, so it ll move faster, ie, even before meeting the hour hand at 1.05
Soumit Parida
4 months ago
The hands of a clock coincide 11 times in every 12 hours (Since between 11 and 1, they coincide only once, i.e., at 12 o'clock). The hands overlap about every 65 minutes, not every 60 minutes. Thus the minute hand and the hour hand coincide 22 times in a day.
Soumit Parida
4 months ago
The hands of a clock coincide 11 times in every 12 hours (Since between 11 and 1, they coincide only once, i.e., at 12 o'clock). The hands overlap about every 65 minutes, not every 60 minutes. Thus the minute hand and the hour hand coincide 22 times in a day.
Navisha Hissaria
4 months ago
please explain me the total formation of right angel in one hour?
Ss