Quasar red shifts are usually larger than the red shifts of the visible galaxies
Indicate whether the statement is true or false
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A nonrelativistic electron is accelerated from rest through a potential difference. After acceleration the electron has a de Broglie wavelength of 880 nm
What is the potential difference though which this electron was accelerated? (h = 6.626 × 10-34 J ? s, e = -1.60 × 10-19 C, mel = 9.11 × 10-31 kg) A) 1.9 µV B) 1.7 µV C) 2.2 µV D) 2.5 µV
A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is above the ground. What is the mass of the box?
A) 8.9 kg B) 5.3 kg C) 6.7 kg D) 8.0 kg
One 20-year-old twin brother takes a space trip with a speed of 0.80c for 30 years according to a clock on his spaceship. At the end of this trip, what are (a) his own age and (b) the age of his Earth-based twin brother?
A) (a) 20 y (b) 30 y B) (a) 30 y (b) 50 y C) (a) 50 y (b) 70 y D) (a) 70 y (b) 90 y
An electron has a relativistic momentum of 1.1 × 10-21 kg ? m/s. What percent of its total energy is its kinetic energy? (melectron = 9.11 ×10-31 kg, c = 3.0 × 108 m/s)
What will be an ideal response?