When a metal surface is illuminated with light of wavelength 437 nm, the stopping potential for photoelectrons is 1.67 V
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J • s, e = - 1.60 × 10-19 C, 1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg)
(a) What is the work function of the metal, in eV?
(b) What is the maximum speed of the ejected electrons?
(a) 1.17 eV (b) 7.66 × 105 m/s
You might also like to view...
A projectile leaves the ground at 150 m/s and reaches a maximum height of 0.57 km. If there was no air resistance, at what angle above the horizontal did it leave the ground?
What will be an ideal response?
Buoyancy: A solid object floats in water with three-fourths of its volume beneath the surface. What is the object's density? The density of water is 1000 kg/m3.
A. 1333 kg/m3 B. 1000 kg/m3 C. 750 kg/m3 D. 250 kg/m3
If we know the size of an asteroid, we can determine its density by
A) comparing its reflectivity to the amount of light it reflects. B) looking for brightness variations as it rotates. C) determining its mass from its gravitational pull on a spacecraft, satellite, or planet. D) radar mapping. E) spectroscopic imaging.
An object is dropped and freely falls to the ground with acceleration g. If it is thrown upward at an angle instead, neglecting air drag, the acceleration along its path will be
A) less than g. B) the same. C) more than g.