A cat strolls across your backyard. An hour later, a dog with his nose to the ground follows the trail of the cat. Explain this occurrence from a molecular point of view.

Q: One of the many isotopes used in cancer treatment is 198 79 Au , with a half-life of 2.70 d.…

A: Given Isotope  19879Au Half life  2.7 d To find out The mass of this isotope that is required to…

Q: Why is Visible radiation able to remove electrons from sodium but not from zinc?

A: Photoelectric effect: It states that the when light falls on a metal surface it emits electrons.…

Q: The diameter of a carbon nanotube is 1.3 nm. This diameter in S.I. system is O a. 13 x10°m O b. 1.3x…

A: Given  Diameter of carbon Nano tube is d = 1.3 nm   Diameter in SI system is in meter

Q: 1. 8900000000 2. 1768900000000 3. 609800000000000 4. 0.00000000001234 5. 0.00000009034

A: The standard form any number means the number in decimal form with the multiplication of the power…

Q: Among cobalt-60 and LINAC, which one is best for colon cancer, and why? Explain your answer in…

A:

Q: What Is Forward Bias

A: The term biasing refers to the electrical supply or the potential difference associated with a…

Q: What is Prandtl tube?

A: Prandtl tube is also known as the pitot static tube.

Q: Assume that the protons in a hot ball of protons each have a kinetic energy equal to kT, where k is…

A:

Q: The deuteron binding energy may be best expressed as Group of answer choices mn + mp - md where the…

A: We need to calculate the binding energy of deuteron nucleus.

Q: How X-ras work?

A: Answer:-   Solution:- X-Ray or X-Radiation is a highly penetrating radiation form from high-energy…

Q: What happens if you place a neutron and an electron close together?

A: We will answer the question using the fact that same charges repel and opposite charges attract.

Q: When, and by whom, did the first successful intentional transmutation of an element occur?

A: By Ernest Rutherford in 1919, the first successful intentional transmutation of an element occurred.

Q: What is Particle physics?

A: Particle Physics is the branch of science that deals with the nature of the particles that…

Q: Question 1 Calculate the binding energy for 0.064 mole of "He (4.00150 amu) in kJ. Question 2…

A: Given data: Number of moles for He4 is 0.064 having mass mHe=4.00150 amu Number of moles for Be10 is…

Q: 6) A radioisotope has a half-life of 6 hours. If there are 10undecayed atoms, how long will it take…

A: Recall N=N0e-λt and t1/2=ln2/λ

Q: What is the age in years of a bone in which the 14C/12C ratio is measured to be 2.85×10−13?  Express…

A:

Q: Why do you think that the energy level in the n- region is lower than the p-region?

A: The n-type region has trivalent impurity while a p-type region has pentavalent impurity.

Q: What is the difference between a scanning electron microscope and scanning a probe microscope?

A: SOlution: The difference between a scanning electron microscope and scanning a probe microscope.

Q: What do you understand by crystallography?

A: Crystallography is the study of crystals, their structures and properties. Crystals are arranged in…

Q: What are tunneling nanotubes?

A: Introduction: A tunneling nanotube or membrane nanotube is a term that has been applied to…

Q: a substance has a half life of 1000 years, and an initial mass of 100 grams, how much of the…

A: half-life of substance= 1000 Years No= Initial mass= 100 grams

Q: what are barrier elements ?

A: Barrier element are the elements which prevent the unintentional flow of gasses or fluids from a…

Q: How is collision between two billiards balls different from a collision between an alpha-particle…

A: There are three different kinds of collisions. Elastic Inelastic Completely inelastic.

Q: All these medical procedure make direct use of radioisotope, EXCEPT: Group of answer choices…

A: Tc 99 scan, brachytherapy and PET scan use radioisotopes directly but x ray treatment of cancer uses…

Q: The atoms that constitute your body are mostly empty space, and structures such as the chair you’re…

A:

Q: If you start with 7.0×1010I7.0×1010I-131 atoms, how many are left after approximately 1 month?…

A: In this problem, the initial amount of I-131 atoms and half-life are given and we have to find the…

Q: What is the relationship between p and m?

A: P is linear momentum in the standard notation.  m is the mass of the body. Mass restricts the speed…

Q: Why didn’t atoms exist until hundreds of thousands of years after the Big Bang?

A: When the Big Bang occurred, the temperature and the density was too high, and it didn’t allow to…

Q: Francium-223hasahalf-lifeof21.80min. i.…

A:

Q: In preparation for an MRI scan, why are patients advised to remove eyeglasses, watches, jewelry, and…

A: MRI means magnetic resonance imaging.

Q: How does the wave model of electrons orbiting the nucleus account for discrete energy values rather…

A: An electron is circling the nucleus in standing waves. Then the boundary of these wave orbits is a…

Q: How does a nucleus stay packed tightly together?

A: It is known fact that like charges always repel each other and opposite charges attracts each other…

Q: Theheatingelementinanelectrickettleisratedas2.0kW.Ifthewaterinthekettle…

A:

Q: The radius of a carbon nanotube is 5nm. This radius in the S.I. system of units is O a. 5x10-12 m O…

A: Option b is the right answer  5 × 10^-9 m

Q: If a patient ingests a small quantity of l'31 for treatment of hyperthyroidism. The lifetime of 131…

A: The given data are: t12=8.1 dayst=16.2 days Here, t12 denotes the half-life and t denotes the time.

Q: Discuss why equal masses of carbon atoms and oxygen atoms don't contain the same number of…

A: When a loaf of bread is squeezed its volume will decrease and as there is no loss of the mass the…

Q: where did 19209.6*10^-11 came from?

A:

Q: Which of the cells in the figure below are primitive? Is there a Wigner- Seitz cell in figure below…

A:

Q: What is threshold effect?

A: Threshold effect is the phenomena in which after certain value of that characteristics of that…

Q: Are most of the atoms around us younger or older than the Sun?

A: Step 1 Sun is a star at the center of our universe. It is a sphere of hot plasma. Right now it is on…

Q: How many half lives must pass for a substance to lose 87.5% of its original amount? Group of answer…

A: N(t)=No(0.5)t/h h=half life N(t)=100-87.5=12.5 No = 100

The Bohr model

Students often get confused between Rutherford’s model and Bohr model of an atom. They interpret the postulates of both these models to be the same, which is incorrect. Rutherford’s model differs from Bohr’s model in the following ways: