What is the result of 1.58 ÷ 3.793 written with the correct number of significant figures?
A) 4.1656 × 10-1
B) 4.166 × 10-1
C) 4.17 × 10-1
D) 4.2 × 10-1
E) 4 × 10-1
C
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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?
One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s . How far is 1 light-year?
A) 1.08 billion km (1,080,000,000, or 1.08 × 109 km) B) 300 thousand km (300,000, or 3 × 105 km) C) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km) D) 18 million km (18,000,000, or 1.8 × 107 km)
A uniform linear charge of 2.0 nC/m is distributed along the x axis from x = 0 to x = 3 m. What is the x component of the electric field at y = 2 m on the y axis?
a. ?5.0 N/C b. ?4.0 N/C c. ?5.7 N/C d. ?6.2 N/C e. ?9.0 N/C
Which one of these elements is normally the remnant of a supernova?
A) hydrogen B) helium C) silver D) none of these