Mathilda collects photoelectric data in her physics laboratory
She measures a stopping potential of 5.82 volts for radiation of wavelength 100. nm, and 17.99 volts stops 50.0 nm.
(a) What is the work function for the material in eV?
(b) From her data one determines Planck's constant to be what?
(a) 6.70 eV
(b) 6.50 × 10-34 J-s
You might also like to view...
What is the inductance of a coil that has an emf of 0.82 V induced in it while the current through it is changing at 2.0 A/s?
A. 3.3 H B. 33 mH C. 1.6 H D. 41 mH E. 0.41 H
Springs: An ideal spring stretches by 21.0 cm when a 135-N object is hung from it. If instead you hang a fish from this spring, what is the weight of a fish that would stretch the spring by 31.0 cm?
A. 199 N B. 91 N C. 145 N D. 279 N
Light travels through non-cubic transparent crystals
A) in mutually perpendicular directions. B) without refracting. C) and becomes polarized in the process. D) at different speeds along different optic axes. E) none of the above
How does dark energy affect the expansion of the Universe?
What will be an ideal response?