The speed of the electron emitted in the radioactive beta-decay is determined as 2.186 x 10⁶ m/s.
<h3>Speed of electron </h3>
The speed of the electron is determined from the total energy of the electron.
Assuming the emitted electrons are in first energy level, E = 13.6 eV
K.E = ¹/₂mv²
v² = 2K.E/m
v² = (2 x 13.6 x 1.6 x 10⁻¹⁹)/(9.11 x 10⁻³¹)
v² = 4.777 x 10⁻¹²
v = 2.186 x 10⁶ m/s
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' A ' and ' C ' both say the same thing, and both are correct statements. But they're not a reason to call any part of the moon a "dark side". No part of the moon is dark for more than 2 weeks at a time, and the only reason to talk about a "dark side" of it is ignorance.
Answer:
3 meters
Explanation:
Given that,
Fido is initially standing near the person's feet. Initially, he jogs 10 meters in a straight line to retrieve a stick and carries it 7 m back toward the person before lying on the ground to chew on the stick.
Initially, he covers 10 meters of distance then it comes towards the person and covers 7 meters in front of the person.
It is clear that he is at a distance of 10 meters - 7 meters = 3 meters
Answer:
it was made in July 29, 1958, United States
it was founded by
Dwight D. Eisenhower
The first rocket which could fly high enough to get into space was the V2 missile which was first launched by Germany in 1942. The first rocket which actually launched something into space was used to launch Sputnik, the first satellite, on October 4, 1957. The rocket that launched Sputnik was a R-7 ICBM rocket.
Explanation:
Answer:
4hrs
Explanation:
speed =72km/hr
distance= 300km
time =?
<h3>
<u>speed = distance/time</u></h3>
using this formula we make time the subject of the formula
time = distance/speed
time = 300/72
time = 4.1
therefore,
<em>time is equal to 4hrs</em>
