In a ruby laser, an electron jumps from a higher energy level to a lower one. If the energy difference between the two levels is 1.8 eV, what is the wavelength of the emitted photon?
A)
350 nm
B)
470 nm
C)
650 nm
D)
690 nm
E)
960 nm
D
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An aircraft weighs 1,500 N, its mass is
a. 1,500 kg. b. 750 kg. c. 153 kg. d. mass cannot be determined
A baseball pitcher loosens up his pitching arm. He tosses a 0.140-kg ball using only the rotation of his forearm, 0.270 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 24.0 m/s in a time of 0.425 s, what torque is applied to the ball while being held by the pitcher's hand to produce the angular acceleration?
a. 29.3 N·m b. 21.3 N·m c. 2.13 N·m d. 2.93 N·m e. 209 N·m
An electron inside a hydrogen atom is confined to within a space of 0.110 nm
What is the minimum uncertainty in the electron's velocity? ( h = 1.055 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 1.05 × 106 m/s B) 1.05 × 108 m/s C) 1.50 × 106 m/s D) 1.05 × 1010 m/s E) 1.50 × 108 m/s
A ball is thrown straight up with a speed of 30 m/s
(a.) How long does it take the ball to reach the maximum height? (b.) What is the maximum height reached by the ball? (c.) What is its speed after 4.2 s?