複選題Problem 15 Which of the following statements are correct? (A) For a collection of hydrogen atoms in the ground state illuminated by ultraviolet light of wavelength 59.0 nm, the kinetic energy of the emitted electrons is 21.0 eV, neglecting a small recoil kinetic energy imparted to the proton. (B) For protons incident on a copper foil 5-µm thick, the proton kinetic energy required to achieve a distance of closest approach of 5.0 fm is about 8.4 meV. (C) The velocity of electron in the n = 3 state of hydrogen is 730 km/s. (D) The shortest wavelength of the Lyman series of singly ionized helium is 22.8 nm. (E) According to Bohr's correspondence principle, the quantum distributions approach the classical distribution when n is large.

複選題

Problem 15 Which of the following statements are correct?
(A) For a collection of hydrogen atoms in the ground state illuminated by ultraviolet light of wavelength 59.0 nm, the kinetic energy of the emitted electrons is 21.0 eV, neglecting a small recoil kinetic energy imparted to the proton.
(B) For protons incident on a copper foil 5-µm thick, the proton kinetic energy required to achieve a distance of closest approach of 5.0 fm is about 8.4 meV.
(C) The velocity of electron in the n = 3 state of hydrogen is 730 km/s.
(D) The shortest wavelength of the Lyman series of singly ionized helium is 22.8 nm.
(E) According to Bohr's correspondence principle, the quantum distributions approach the classical distribution when n is large.

答案：登入後查看
統計： 尚無統計資料

詳解 (共 1 筆)

MoAI - 您的AI助手

B1 · 2026/10/20

#7611903

解題重點本題綜合測驗光電效應、拉塞福散...

(共 1755 字，隱藏中）

前往觀看

複選題Problem 18Which of the following descriptions are true regarding blackbody radiation, the photoelectric effect, and theoretical models for the specific heat of solids? (A) The energy density spectra of blackbody radiation are independent of the material composition and the shape of the object forming the blackbody. Moreover, a blackbody is not necessarily black in color. (B) In the Rayleigh-Jeans formula, the average energy of electromagnetic (EM) standing waves inside a blackbody was calculated using the equipartition principle, which is incorrect. Additionally, the number of standing waves per frequency is also inaccurate. (C) In the high-temperature limit, the specific heat of solids, as predicted by Einstein's and Debye's models, approaches the classical limit of 3R, where R is the universal gas constant. However, in the low-temperature limit, Einstein's model overestimates the specific heat. (D) Based on Einstein's photon hypothesis, EM waves can be treated as particles whose energy is proportional to their frequency and particle number. Consequently, the energy of EM standing waves inside a blackbody is quantized, which explains the physical origin of Planck's blackbody radiation formula. (E) In the photoelectric effect, the stopping voltage is independent of the intensity of the incident EM wave but depends on its frequency f. The photoelectric current increases with increasing EM wave intensity as long as hf exceeds a certain threshold, where h is Planck's constant.

詳解 (共 1 筆)

相關試題

相關試卷