The word "radioactive" means
A. an atomic nucleus absorbs neutrons.
B. there is significant interference between atomic radiation and radio reception.
C. an atom spontaneously captures an electron from a neighboring atom.
D. there are nuclei present which will spontaneously emit nuclear radiation.
Answer: D
You might also like to view...
Explain why the spring and neap tides occur periodically
What will be an ideal response?
The radius of a typical nucleus is about 5.0 × 10-15 m. Assuming this to be the uncertainty in the position of a proton in the nucleus, estimate the uncertainty in the proton's energy (in eV)
What will be an ideal response?
Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. How large is the shift in wavelength?
A) 2 nm B) 0.2 nm C) 0.02 nm
In a diffraction grating experiment, light of 600 nm wavelength produces a first-order maximum 0.35 mm from the central maximum on a distant screen
On the same screen, a second monochromatic source produces a third-order maximum 0.87 mm from the central maximum when it passes through the same diffraction grating. What is the wavelength of the light from the second source?