If the de Broglie wavelength of an electron is 380 nm, what is the speed of this electron? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A) 2.0 km/s
B) 3.8 km/s
C) 1.9 km/s
D) 4.1 km/s
E) 5.2 km/s
C
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Stars with masses greater than 1.1 solar masses use the ____________________ to convert hydrogen into helium and produce energy
Fill in the blank(s) with correct word
An object of mass 4.0 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. Ignore friction and use g = 10 m/s2. How high did the object go?
A) 20 m B) 4.5 m C) 15 m D) 80 m E) None of the other choices is correct.
A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet, assuming no air?
A) 9.8 m/s B) 25 m/s C) 49 m/s D) 98 m/s