Matter Waves: If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum, what is the speed of the electron? (melectron = 9.11 × 10-31 kg, c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1900 m/s
B. 2100 m/s
C. 1700 m/s
D. 1500 m/s
E. 540 m/s
Answer: A
Physics & Space Science
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Projectile Motion: A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground. At what angle below the horizontal does the ball approach the ground?
A. 35° B. 42° C. 48° D. 40° E. 65°
Physics & Space Science
The coulomb, which is the unit of charge, is the charge on one electron
Indicate whether the statement is true or false
Physics & Space Science
In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are
A) hydrogen. B) oxygen. C) both the same D) not enough information
Physics & Space Science
Distinguish between dependent and independent variables
Physics & Space Science