IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: Saladin on January 29, 2010, 10:56:51 am

Title: Physics
Post by: Saladin on January 29, 2010, 10:56:51 am

1. Distinguish between line spectra and continious spectra
2. Emission spectra and absorption spectra
3. Excitation and ionisation.

I know the answers to all of them, but I just want to check with all u guys.

Title: Re: Physics
Post by: astarmathsandphysics on January 29, 2010, 11:12:33 am

1. Distinguish between line spectra and continious spectra - continuous spectra occupies an interval of wavelengths but a line spectra is only for certain wavelengths
2. Emission spectra and absorption spectra - imposed on a continuous spectra, an emission spectra will be peaks and a line spectra troghs. Emission spectra are emitted by excited atomes decaying. Absorption spectra are due to electrons becoming excited.
3. Excitation and ionisation. Excitation - electrons move to a higher energy level. Ionisation - electrons are ejected from the atom/.

Title: Re: Physics
Post by: Saladin on January 29, 2010, 11:17:07 am

A perfect answer-------as usual......