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Material Type: Assignment; Professor: Zorba; Class: College Physics II; Subject: Physics; University: Whittier College; Term: Unknown 1989;
Typology: Assignments
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Dr. Zorba 1 - ) (a) How hot is a metal being welded if it radiates most strongly at 440 nm? (b) What is the temperature if the peak of a blackbody spectrum is at 25.0 nm? (c) What is the wavelength at the peak of a blackbody spectrum if the body is at a temperature of 2800 K? 2 - ) An HCl molecule vibrates with a natural frequency of 8.1x 10 13 Hz. What is the difference in energy (in joules and electron volts) between possible values of the oscillation energy? 3 - ) Estimate the peak wavelength for radiations from (a) ice at 0º C, (b) a floodlamp at 3300 K, (c) helium at 4 K, assuming blackbody emission. (d) What region of the electromagnetic spectrum is each? 4 - ) (a) What is the energy range in eV, of photons in the visible spectrum, of wavelength 400 nm to 750 nm? (b) What color of light carries more energy, blue or red? Explain why? 5 - ) In a photoelectric-effect experiment it is observed that no current flows unless the wavelength is less than 570 nm. (a) What is the work function of this material? (b) What is the stopping potential required if light of wavelength 400 nm is used?