Beats: Two taut strings of identical mass per unit length are stretched with the same tension with their ends fixed, but one string is 0.330 cm longer than the other. Waves on these strings propagate at 34.0 m/s.The fundamental frequency of the shorter string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency?
A. 12.3 Hz
B. 9.00 Hz
C. 12.0 Hz
D. 12.7 Hz
E. 11.3 Hz
Answer: A
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A mass-spring system on a horizontal frictionless surface is set in simple harmonic motion with amplitude A. The mass is then doubled and the system is again set into simple harmonic motion with the same amplitude. Which of the following is true about the total mechanical energy of the system due to doubling the mass?
a. It has doubled. c. It has halved. b. It has quadrupled. d. It has not changed.
Photoelectric Effect Using Stopping Potential: When a photoelectric surface is illuminated with light of wavelength 437 nm, the stopping potential is measured to be 1.67 V. (1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)(a) What is the work function of the metal, in eV?(b) What is the maximum speed of the ejected electrons?
What will be an ideal response?
The position of a cart that is oscillating on a spring is given by the equation
x = (12.3 cm) cos[(1.26 s-1)t]. When t = 0.805 s, what are the (a) velocity and (b) acceleration of the cart?
An electron is in an infinite square well (a box) that is 8.9 nm wide. What is the ground state energy of the electron? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19)
A) 0.0048 eV B) 0.0057 eV C) 0.0066 eV D) 0.0076 eV E) 0.0085 eV