Problem 31E

Quantized Energy and Photons (Section)

Molybdenum metal must absorb radiation with a minimum frequency of 1.09 × 1015 s-1 before it can eject an electron from its surface via the photoelectric effect.

(a) What is the minimum energy needed to eject an electron?

(b) What wavelength of radiation will provide a photon of this energy?

(c) If molybdenum is irradiated with light of wavelength of 120 nm, what is the maximum possible kinetic energy of the emitted electrons?

Astronomy Chapter 4 Motion, Energy, & Gravity Terms to know ● Speed Rate at which objects move ● Velocity Speed & direction ● Acceleration Any change in velocity ● Momentum= mass x velocity ● Net force Changes momentum, which generally means an acceleration ● Angular Momentum The rotational momentum of a spinning or orbiting object ● Mass The amount of matter in an object ● Weight The force that acts on an object ● Thermal Energy The collective energy of many particles ● Ellipse Elongated circle ● Escape velocity If an object gains enough orbital energy, it may escape Acceleration of Gravity All falling objects accelerate at the same rate (not counting friction of air resistance) On Earth, speed increases 10m/s with each second of falling Galile