The mass of helium atoms are higher than predicted given the number of protons. Helium atoms have an actual mass of about 4 amu.
In fact, most atoms seem to be too heavy. Lithium is known to have 3 protons, but a mass of 7 amu, carbon atoms have 6 protons and a mass of 12 amu.
Rutherford proposed the idea that there could also be another particle in the nucleus with the protons. He thought these particles would be neutral and named them neutrons.
How does the idea of a neutron help address the puzzles about the protons in the nucleus and the mass of atoms?
Rutherford proposed the idea that there could also be another particle in the nucleus with the protons. He thought these particles would be neutral and named them neutrons.
How does the idea of a neutron help address the puzzles about the protons in the nucleus and the mass of atoms?
1 answer:
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Answer:
50 dB.
Explanation:
given,
Amplification needed by the woman,I= 1 x 10⁵ I₀
where as I₀ is the threshold frequency
overall hearing loss of the woman= ?
Using the equation of sound intensity level
The overall hearing loss of woman is equal to 50 dB.
Answer:
A) 10 m/s
Explanation:
We know that according to conservation of momentum,
m1v1 + m2v2 = m1u1 + m2u2 ..............(equation 1)
where m1 and m2 are masses of two bodies, v1 and v2 are initial velocity before collision and u1 and u2 are final velocities after collision respectively.
From the given data
If truck and car are two bodies
truck : m1 = 2000 Kg v1 = 5 m/s u1 = 0
car : m2 = 1000 kg v2 = 0 u2 = ?
final velocity of truck and initial velocity of car are static because the objects were at rest in the respective time.
substituting the values in equation 1, we get
(2000 x 5) + 0 = 0 + (1000 x u2)
u2 = x 5
= 10 m/s
Hence after collision, car moves at a velocity of 10 m/s