Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
pglasg74:
--- Quote from: ~VIN1094~ on May 25, 2010, 10:46:43 pm --- remember this ..
In a beta decay a neutron changes to a proton and an electron .. The proton remains in the nucleus and electron is emitted as a beta particle
eg . isotope of carbon .. carbon 14
146C ----> 714N + -1e
in your ques .. 145 neutrons remain the same .. 92 protons INCREASE to 93
--- End quote ---
that's what i thought but the answer is B not D :S:S
6394:
lol guess wat ppl aftr finishin 09 p1 i was lukin thru ms n aftr checkin more dan half i realizd k i opnd chem ms
>:( ;D ;D ;D ;D ;D
pglasg74:
i have a thought, you know how you said a neutron changes to a proton and electron? ok that means the neutron doesn't exist so 145 becomes 144, buuuut since it makes a proton, 92 becomes 93, and the electron isn't a concern.. am i right or too much analysis? By the way how was chem p1?
Vin:
--- Quote from: pglasg74 on May 25, 2010, 10:45:19 pm ---
thxxx 4 ans. mine, can u answer the fuse one as well? and also, can you tell me oct/november 2006 #23 please? CAN SOMEONE TELL ME TEH RELATION BETWEEN FREQUENCY, AMPLITUDE, PITCH AND LOUDNESS PLEASEPLEASEPLEASEPLEASE?
--- End quote ---
for the fuse one i have modified the post .. can u post a ques frm a past paper .. it'll be easy to explain ..
Amplitude is the height ..
Frequency is the number of oscillations per sec
Pitch depends upon the frequency of the wave .. high-pitched is high frequency but smaller wavelength and Low-pitch is low frequency and greater wavelength
$H00t!N& $t@r:
--- Quote from: ~VIN1094~ on May 25, 2010, 10:51:47 pm ---
OK listen .. A is a variable resistor .. so it can be used to vary the pd/current/resistance .. BUT if u notice it is connected in parallel with the lamp .. the rule states that appliances connected in parallel receive EQUAL pd ..
B is a potentiometer(variable resistor) here it is used as a rheostat where it has a sliding contact which is used to vary the current and pd ..
--- End quote ---
ahhh i see. Thanks again! ;)
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version