Photoelectric Effect Using Stopping Potential: In her physics laboratory, Mathilda shines electromagnetic radiation on a material and collects photoelectric data to determine Planck's constant. She measures a stopping potential of 5.82 V for radiation of wavelength 100 nm, and 17.99 V for radiation of wavelength 50.0 nm. (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s)(a) Using Mathilda's data, what value does she determine for Planck's constant?(b) What is the work function of the material Mathilda is using, in electron-volts?
What will be an ideal response?
(a) 6.49 × 10-34 J ? s (b) 6.35 eV
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A drive shaft resists torsional shear stress of 45 MPa and axial compressive stress of 100 MPa. The maxi- mum shear stress is approximately:
(A) 42 MPa
(B) 67 MPa
(C) 71 MPa
(D) 93 MPa
Betelgeuse is a star in the constellation Orion. It radiates heat at the rate of 3.00 × 1030 W and has a surface temperature of 3000 K
Assuming that it is a perfect emitter, what is the radius of Betelgeuse? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4). A) 7.80 × 1010 m B) 8.70 × 1010 m C) 1.40 × 1011 m D) 1.90 × 1011 m E) 2.30 × 1011 m
A 0.150-kW lamp is plugged into a 120-V ac wall outlet. What are (a) the peak current through the lamp, (b) the rms current through the lamp, and (c) the resistance of the lamp?
What will be an ideal response?
Which of the following is an advantage that liquid water has as a biological solvent compared to other alternatives?
A) when it freezes it becomes less dense B) it is a liquid over a wide temperature range and remains liquid at higher temperatures C) it is able to dissolve many things D) all of these are advantages