Answer all, please PHYSICS- of the the metal source of any -During an experiment

Question

Answer all, please
PHYSICS- of the the metal source of any -During an experiment, a scientist discovers that adim source of red light w tof cause a metal surface to discharge electrons From your knowled e of blue light photoelectric effect, which of the following light sources might cause the surface to discharge electrons? (Choose as many as apply) (A) a dim s wavelength associated electromagnetic radiation with a frequency lower than that of red light source of red light (C) a dim source of blue light (D) a bright source of blu hri Whic h of the following would you expect to have the largest wavelen 14 are not much larger than the atoms of lighter tons to the nucleus increases the electrical with it? (A) a quick-moving it? (A) a quick-moving bee (B) an electron orbiting a nucleus (Coe umbering elephant (D) the carth orbiting the sun s are not much larger than 15 The atoms of heavier element adding pro them lements cause (A) ariQA) adling protons to the nucleus in the orbiting electrons, creating smaller orbits (B) adding protons t the nucleus increases the electrical repulsion on out of the higher energy levels (C) heavier elements te higher energy levels (C) heavier elements tend to have fewer energy levels than lighter elements (D) none of these; atoms of heavier elements are, in fact, much larger than the atoms of lighter elements. (Choose as many as apply) The (B) makesu most Which of the following statements are true? 6. nucleus (A) makes up only a tiny part of the volume of an atom of the volume of an atom (C) accounts for only a tiny amount of the mass of an atom (D) accounts for most of the mass of an atom. An alpha particle is a (A) helium atom (B) helium nucleus (C) hydrogen atom (D) hydrogen nucleus Which of the following statements are true about radioactive elements? (Choose as many as apply.) (A) They never decay into elements with lower atomic numbers. (B) They never decay into elements with higher atomic numbers (C) They sometimes decay into elements with higher atomic numbers. (D) They sometimes decay into elements with lower atomic numbers. (E) They sometimes decay into elements with the same atomic number. A rock can be dated by (A) finding the amount of carbon-14 in the rock (B) finding what percentage of the lead isotopes in the rock are lead 206 or lead 207 (C) finding the ratio of carbon-14 to uranium in the rock (D) there is no known method for dating rock at present. Radioactive tracers apply.) (A) detect the amount of fertilizer taken up by plants (B) study the process of digestion in humans (C) study how parts of (D) The use of radioactive tracers has been abandoned because they to humans are used to do which of the following? (Choose as many as an automobile test engine wear away Most radiation experienced by an average individual in the United Stat by (A) medical and dental X-rays (B) weapons tests (C) natural radioactivity (D) nuclear power plants. are angerous the United States is caused grou nd

Explanation / Answer

(14)

lamda = h/mv

since electron mass is low it has longer wave length

option(B) is correct

(17)

option (b)

(18)

option (b)

19

option(A)

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