Answer: d) The atomic number decreases by 2
Explanation:
A particle alpha is He(2+)
Where we have:
A = 4
Z = 2
The atomic number, the number of protons, must be conserved:
At the beginning (before the emission) we have Z protons.
After the emission, we will have an element with an atomic number X , and an alpha particle with an atomic number = 2.
Then the total number of protons after the emission is X + 2.
The conservation equation is:
Z = X + 2
Isolating X we get:
X = Z - 2
Then after the emission, the atomic number is decreased by 2.
The correct option will be:
d) The atomic number decreases by 2
Answer:
Explanation:
The answer is B.
B) C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g)
Answer:
258 Hz or 266 Hz
Explanation:
When two sounds of similar frequency occur at the same time, a phenomenon called "beat" occurs. The beat is an interference patter between the two sounds; the frequency of this beats (called beat frequency) is given by the difference between the frequencies of the two sounds:
where
is the beat frequency
is the frequency of the 1st sound
is the frequency of the 2nd sound
In this problem,
is the beat frequency
is the frequency of the middle C tuning fork
is the frequency of the middle C piano string
Solving for f2, we find two solutions:
Answer:
u = - 38.85 m/s^-1
Explanation:
given data:
acceleration = 2.10*10^4 m/s^2
time = 1.85*10^{-3} s
final velocity = 0 m/s
from equation of motion we have following relation
v = u +at
0 = u + 2.10*10^4 *1.85*10^{-3}
0 = u + (21 *1.85)
0 = u + 38.85
u = - 38.85 m/s^-1
negative sign indicate that the ball bounce in opposite directon
Answer:
Option D
X: positive
Y: positive
Explanation:
They repel each other so both the charged particles will have same charge.
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