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In neutral atoms, the number of protons and electrons is equal. Since protons are assigned a +1 charge and electrons are assigned a -1 charge, the atom with equal amounts of protons and electrons is neutral. In ions, this is not so. In ions, the number of protons and electrons are either gained or lost electrons. So, if lithium, Li, is written as Li+, you know that lithium has lost one electron. In losing one electron, lithium will have one proton more than its number of electrons, producing an offset of +1 in charge. Ions can have a variety of charges, such as +, -, +2, -2 and so on. (For +1 and -1 charges the "1" is sometimes not written and only the + and - are written.) Remember: When ions are formed only electrons are added or removed. The number of protons cannot be changed. Doing so would change the identity of the element (as is done in a nuclear reaction). It is always electrons being added or removed from an atom to form an ion. Fill in the blanks to determine the number of protons and electrons in an oxygen ion. (Consult the periodic table to determine the number of protons in a neutral oxygen atom.) The O^2- ion has protons and electrons. Express your answers as integers separated by a comma. If a neutral atom gains or loses electrons, it will become a charged particle called an ion. Cations have a positive charge, and anions have a negative charge. For example, the figure below depicts a sodium atom becoming a 1+ cation by losing one electron, and a chlorine atom becoming a 1- anion by gaining an electron. After which, the sodium cation has a total of 10 electrons and the chloride anion has a total of 18 electrons.
22. The overall lightness or darkness of a radiograph is called a. density b. contrast c. definition d. f ∘ g packets following ry store film 24. What device is used to control the size and shape of the primary x-ray beam? a. filter b. rectifier c. collimator d. film holder 25. Which material provides the best protection from x-ray photons? (stops xrays) a. aluminum b. concrete c. lead d. wood 26. The cervical collar on a lead apron is placed to protect the: a. reproductive organs b. vital organs in the chest area c. thyroid gland d. spinal column 27. According to the nuclear regulatory commission, the annual maximum permissible dose (MPD) to occupationally-exposed individuals should not exceed: a. .03 Sv(30 msv) b. .05 Sv(50 mSv) c. 3.0 Sv(3000 mSv) d. 5.0 Sv(5000 mSv) 29. The paralleling technique of radiographic exposure fulfills which of the following principles of ideal projection? 1. The radiation source is small 2. The source-object distance is long 3. The object-film distance is short 4. The object and film are parallel 5. The central ray strikes the object and film at a 90 degree angle a. 1,2,3,4 b. 1,2,3,5 c. 1,2,4,5 d. 1,3,4,5 e. 1,2,3,4,5 30. After the x-ray unit is turned off, for how long do x-rays continue to exist in the room? a. For 6 seconds if the exposure time was 1 / 6 second b. For 6 minutes if the exposure time was 1 / 6 second c. It depends on the humidity in the room d. It depends on the kvp setting e. The x-rays no longer exist in the room once the exposure is complete
his initial stage captures students' interest and helps them connect new learning to their prior knowledge. Activities at this stage include posing a thought-provoking question or demonstrating an unexpected event. The goal is to stimulate curiosity and encourage students to ask their questions about the topic. Teachers play a crucial role in facilitating discussions and helping students make connections between what they already know, and the new concepts being introduced. EXPLORE Students collaborate to problem-solve to gain a conceptual understanding of the concept. The teacher asks probing questions and provides prompts to groups and individuals as they work to help them move toward mastery of the objective. (20 minutes) Provide students with materials to create a simple model of the water cycle. For example, they could use a plastic container, water, a heat source such as a lamp, and ice to simulate evaporation, condensation, and precipitation. Students should observe and record the changes they see. This stage involves direct activities where students engage directly with the materials, allowing them to explore and discuss their ideas with peers. The teacher will model the activity to ensure students understand the task and can work effectively towards mastering the lesson's objectives. Students explain/share findings from the EXPLORE activity and the teacher facilitates class discussion. The teacher models and asks questions using student input to help connect student responses with the big idea of the lesson. Vocabulary and big-idea concepts are formally introduced (20 minutes) Discussion Facilitate a class discussion where students share their observations from the water cycle model. The teacher can ask guiding questions such as 'What did you notice about the water in the container?' and 'How does this model represent the different stages of the water cycle?' Direct Instruction Gather the class together and discuss what they observed during the water cycle activity, having each group share their findings and observations. Asking guiding questions like 'What did you notice the water in the container when we applied heat?' or 'Can someone explain what happened to the water?'
Instructions For this assignment, you will be investigating an armed robbery and will create a preliminary report based on the information below. An important tool for law enforcement is a written document, especially in the form of an offense report. The reporting system provides a permanent record for all to see and be used to explain what happened during a specific event. A vital part of the reporting system is accurate and thorough information documented by the report writer. There are several types of reports that you had access to concerning our different scenarios. Basic reporting tools that police officers utilize are: - Offense Report to include the Narrative (Official Report) - Supplemental Report (Report where follow-up investigations are noted / a Supplement Report in generally not available to the public or media) - Notes (Written supplement used by initial officer/ generally not included with official report) - Sketches (Can be used as a Supplement Report or preliminary investigations) You are dispatched to the scene of an armed robbery of a convenience store. You will be responsible for the preliminary report. Your report should include everything from Time Dispatched until the officer left the scene, Create your own scenario and write the report using the examples listed. I want to be able to read your report and envislon what happened without having been at the scene. Also, describe the importance of these reports that you used during this investigation. You may review some of our scenarios this term for ideas. Consider these facts as you complete your written report. - The clerk was alone inside when the robbery occurred, - A customer had just pulled up and observed the suspect run from inside the store. - A customer was pumping gas as the incident unfolded Submit your Word file assignment.
Q4. A body with density d=2 g / cm^3 sinks in the liquid with density d=1g / cm^3, If drag force Ff=100 v Vb eta. Where Vb is volume of the body, v=20 m / s is terminal velocity and eta is viscosity. Find the viscosity eta. A) 1 Pas B) 2 Pas C) 4 Pa.s D) 5 Pa.s E) 3 Pa.s Q5. Which one is incorrect. A) In specular reflection some of the reflected rays are parallel. B) In diffuse reflection some of the reflected rays can be parallel. C) For the image in a plan mirror right is left. D) A reflection produced by a smooth surface is Specular. E) Reflection from a rough surface is Diffuse. Q6) 2 kg metal with volume 10^(-3) m^3 sinks in the liquid with density 1g / cm^3. What is the acceleration of the metal in terms of the gravitational acceleration g. A) g / 5 B) g / 3 C) g/4 D) g E) g / 2 Q7) 216 kg spherical object with density 2 g / cm^3 sinks in the liquid with density 1 g / cm^3 and viscosity eta=10 / 3 Pa.s. What is the terminal velocity in terms of m / s. (Assume pi=3 and g=10) A) 50 B) 40 C) 30 D) 60 E) 20 Q8) How much heat energy is required to increase the temperature of 2 kg water from 40 Celsius to 80 Celsius? ( C=1 cal / gK ) A) 40000 cal B) 80 Cal C) 80 cal Q9) If temperature decreases to K=0 Kelvin entropy goes: A) zero B) maximum C) does not change D) remains constant E) none Q10) Galvanometer measures: A) Resistance B) Voltage C) Current D) Capacitance E) none Q11) A cubic object with volume 27000 cm^3 and density 2 g / cm^3 is on the incline with angle 60 degrees. find the pressure on the surface of the incline. A) 30000 Pa B) 20000 Pa C) 60000 Pa D) 3 Pa E) 6 Pa Q12) After closing the S gate. If the capacitance is C=2 F, what is the charge of the capacitor at the end? A) 6 C B) 3 C C) 9 C D) 2 C E) none