CHM1011 Study Guide - Quiz Guide: Oil Drop Experiment, Cathode Ray Tube, Paraffin Wax

• School: Monash University
• Department: Science - Chemistry
• Course: CHM1011
• Professor: Various

Document Summary

Nu(cid:373)(cid:271)er of proto(cid:374)s i(cid:374) a(cid:374) ato(cid:373)(cid:859)s (cid:374)u(cid:272)leus is the ato(cid:373)i(cid:272) (cid:374)u(cid:373)(cid:271)er (cid:894))(cid:895) Mass number (a) is given by the total number of protons plus neutrons. All electromagnetic radiation travels at the same velocity. The speed of light (c) = 3 x 108 m/s. Amplitude: height of wave from central line. Frequency: number of wave crests passing a point per 1 second (s-1 or hz) Frequency and wavelength can be related using this formula: frequency (v) x wavelength (h) = the speed of light (c) Wave nature of light does not explain distribution of wavelengths emitted by a glowing object. Pla(cid:374)(cid:272)k e(cid:454)plai(cid:374)ed this phe(cid:374)o(cid:373)e(cid:374)o(cid:374) (cid:271)(cid:455) assu(cid:373)i(cid:374)g that e(cid:374)erg(cid:455) (cid:272)o(cid:373)es i(cid:374) (cid:858)pa(cid:272)kets(cid:859) called quanta. Einstein used this idea to (cid:272)o(cid:374)(cid:272)lude that (cid:858)photo(cid:374)s(cid:859) have e(cid:374)erg(cid:455) proportio(cid:374)al to frequency: e(cid:374)erg(cid:455) (cid:894)e(cid:895)= pla(cid:374)(cid:272)k(cid:859)s (cid:272)o(cid:374)sta(cid:374)t (cid:894)h(cid:895) (cid:894)6. 63(cid:454)(cid:1005)(cid:1004)34) x frequency (v) Only after exceeding a certain frequency is light able to enable the ejection of electrons from a metal surface.