Question

Help me solve these...............

Answer 1

JimIheya @ User

46)

=The ratio of charge to mass is known as the specific charge of any particle.

=Thus, ratio of specific charges of electron and proton is:

   Electron/Proton
=(Charge of electron/Mass of electron)/(Charge of proton/Mass of proton )

$= \frac{e}{me} \frac{1837 \: me}{e}$
 
Mp = 1

=1837/1 :)
option b

47) Fundamental particles = electrons + protons +Neutrons

=6+6+8
=20
option (d)

:)
48)

Isotones have same no.of neutrons and different atomic number and mass number

so,
given Mass number of A = 76 and atomic number = 32

so , no.of neutrons = 76-32 = 44

Now we want to find out the atomic number of B

mass number of B = 78 ( given )
No.of neutrons = 44 ( we calculated earlier )

so, Atomic number = 78-44 = 34

:)

49) The given elements have same number of neutrons, so they are Isotones

:)

50) Option (b) is the answer
no.of neutrons is all species are 22

:)

Answer 2

Explanation:

The relationship between Voltage, Current and Resistance in any DC electrical circuit was ... Ohms Law is used extensively in electronics formulas and calculations so it is “very important ...