If a Continuous Spectrum of Ultraviolet Radiation Passes Through a Tube

question 196

Multiple Choice

If a continuous spectrum of ultraviolet radiation passes through a tube of cool hydrogen gas,what happens to its spectrum?

• A) All the radiation passes unhindered, except the Lyman L< wavelength, which is absorbed by the atoms.
• B) Some of the radiation at all wavelengths is absorbed, reducing the intensity at all wavelengths uniformly.
• C) All the radiation passes through the tube unhindered because the hydrogen gas is cool and cannot absorb energy.
• D) All the radiation passes through the tube unhindered, except at the specific wavelengths of the Lyman series, Lα, Lβ, and so on, which are absorbed by the atoms.

---

Definitions:

Conditioned Stimulus

A previously neutral stimulus that, after association with an unconditioned stimulus, comes to trigger a conditioned response.

Unconditioned Stimulus

A stimulus that naturally and automatically triggers a response without the need for prior learning.

Conditioned Response

An automatic response established by training to an ordinarily neutral stimulus.

Conditioned Stimulus (CS)

A previously neutral stimulus that eventually elicits a conditioned response after being paired with the unconditioned stimulus.