A sample of a radioactive isotope is placed near a Geiger counter, which is observed to register 160 counts per minute. Eight hours later, the detector counts at rate of 10 counts per minute. What is the half-life of the material?

Q: 1. what phase of matter have particles  close together but are not held rigidly? 2. what phase of…

A: (Since there are multiple questions posted, we will answer the first question for you. If you want…

Q: 1. Was Rutherford’s theory was easily accepted by other physicists? How did his findings lead us to…

A: No.Rutherford’s theory was not easily accepted by other physicists. In 1911, Niels Bohr earned his…

Q: Discuss the equivalence between (x, z, n) and (x, y, a + (1 – a) t) when z = (x, y, t). Can you…

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Q: n hydrogen is fused into helium, energy is released from Choose one: A.  conversion of mass to…

A: Given :- When the hydrogen is fused into helium Find:- energy is released fromChoose one: A.…

Q: 2. Explain the difference between absolute dosimetry, reference dosimetry, and relative dosimetry.

A: Absolute dosimetry It refers to the measurement of a quantity with an instrument of the highest…

Q: Q2) Calculate the density of copper, whose building unit is (FCC) type, the length of the edge of…

A: We need to calculate the density of copper, given that the building unit is FCC type, length of the…

Q: 5.1 Briefly describe the inadequacies of classical physics and their remedies on the following 5.1.1…

A: Failure of classical mechanics to explain the atomic theory :-     There are many aspects regarding…

Q: 15. What is the principle of equivalence in general relativity? A. Gravitational mass is equivalent…

A: 15. What is principle of equivalence in general relativity? The Answer is option A:  Gravitatioanl…

Q: What did Einstein call his greatest blunder?   a. introducing a cosmological constant to his…

A: Einstein described "introducing a cosmological constant to his equations to balance gravity" as his…

Q: 9. Depending how you organize the topics, there are at least 20 branches of Physics. Pick your…

A: Answer : The 20 branches of physics are-   Optics, classical mechanics,…

Q: - What is Weizsacher's semi-empirical mass formula? Explain it's each term.

A: Weizsacher's semi-empirical mass formula.E =a1A -a2A23 - a3ZZ-1A13-a4A-2Z2A±,0a5A34

Q: 1. What is the mass (in grams) of a ball with a velocity of 9.55 m/s and a wavelength of 4.05 times…

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Q: 7. For each law listed below, chose the correct physical description of that law from the choices…

A: The electric field is created by (both stationary and moving) electric charges. The magnetic field…

Q: The branch of science dealing with the study of the flow of energy is called: a. cosmology b.…

A: Introduction: Energy is defined as the capacity to do work.

Q: 1. What is the volume of a tank that can hold 18 754 Kg of methanol whose density is 0.788g/cm³?…

A:

Q: What is the Metastable? A. The state with unusual long lifetime of 10-³ s. B. The excited atoms…

A:

Q: Which of the following things have mass?   a. Dark Energy.   b. Photons.   c. None of the…

A: Answer: (d) dark matter

Q: 4. What is an atom?

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: How did Einstein resolve the conflict between Maxwell’s equations and Newtonian mechanics? A. He…

A: How did Einstein resolve the conflict between Maxwell’s equations and Newtonian mechanics.-

Q: 4. Draw one tree-level, lowest-order Feynman diagram corresponding to the dominant force for each of…

A:

Q: Write down a formula for the energy levels of hydrogen

A: According to Bohr's model of the hydrogen atom, electrons orbit in a fixed orbit radius. The energy…

Q: 2. Carbon has a mass of 12.011 amu and chlorine has a mass of 35.453 amu. What is the mass of carbon…

A:

Q: 5. Is an outside observer able to watch a person cross the Event Horizon of a black hole? A. No, the…

A: The question is:  #5: Is an outside observer able to watch a person cross the Event Horizon of a…

Q: In most models for the early universe, which was the first force to have frozen out of the original…

A: Answer: (c) gravity

Q: 10. What is S/N ratio for a system that has a pressure of x psi and a sample standard deviation of…

A: In this question we have to find what is S/N ratio for a system that has a pressure of x psi and a…

Q: 1. Using all of the rules you have determined, figure out what changes for each of these changes to…

A: .

Q: Theoretical massive particles that weakly interact with other matter are classified as   a. MACHOs.…

A: Theoretical massive particles that weakly interact with other matter are classified as WIMPs. These…

Q: Why is it useful to create an assembly of very slow-moving cold atoms?A. The atoms can be more…

A: Assembly of very slow-moving cold atoms can be created by lowering the temperature of a material.

Q: Explain the concept of quantum theory and how is it relevant?

A: In Quantum theory we assume that energy is not continuous while it is descrete and quantized . It…

Q: Could you please give reasons for your choice of answers.   In which problem is the uncertainty…

A: In which problem is the uncertainty principle coming handy.

Q: at a. it adds a negative term to the total energy of the Universe. b. it pervades the entire of the…

A: More than 85% of the matter or energy of the universe is still unknown to scientists. They are not…

Q: Grand Design by Hawking

A: Classical science defines the physical world solely through the perspective of the observer. The…

Q: Protons can be accelerated to speeds near that of light in particle accelerators. Estimate the…

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Q: Practice: Atom and the Periodic Table Vocabulary out terms to mark off that you have used them.…

A: 1. The mass on the periodic table.(j) average atomic mass. 2. Region surounding the nuceus where…

Q: 5. What is the theoretical value for how long it would take a metal ball to fall 1.5 meters in the…

A:

Q: 1.  Which of the following theories is probabilistic?   a. Newton's Law of Gravity.   b.…

A: We will answer the question by first looking at the definition of the term 'probabilistic'. The…

Q: How do we determine the accuracy and precision of a measurement? What does the uncertainty of relate…

A: Determination of accuracy of a  measurement . Accuracy of a measured value is how close a…

Q: What role does symmetry play in crystallography? What are symmetry operations and how do they work?…

A:

Q: 1. Did the universe have a beginning? Explain. 2. What element did the early Universe contain?

A: To explain about the beginning of universe as follows,

Q: How do we report measurement?

A: