Atoms that have the same number of protons but a different number of neutrons are called

a. ions.
b. molecules
c. atomic pairs.
d. nuclear pairs.
e. isotopes.


e

Physics & Space Science

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As Curtiss thought, our Milky Way is now known to be quite similar to the nearby Andromeda Galaxy, M-31

Indicate whether the statement is true or false

Physics & Space Science

The force that acts between a pair of magnetic poles depends on

A) magnetic pole strength. B) separation distance. C) both of these D) neither of these

Physics & Space Science

A proton moving along the x axis has an initial velocity of 4.0 × 106 m/s and a constant acceleration of 6.0 × 1012 m/s2. What is the velocity of the proton after it has traveled a distance of 80 cm?

A. 5.1 × 106 m/s B. 6.3 × 106 m/s C. 4.8 × 106 m/s D. 3.9 × 106 m/s E. 2.9 × 106 m/s

Physics & Space Science

What is the angular separation of two spectral lines of wavelengths 497 nm and 251 nm formed in the third order with a diffracting grating having 587 lines per millimeter?

A) 34.8° B) 24.8° C) 41.3° D) 29.4° E) 4.21°

Physics & Space Science