What is the ratio of the percent of metals in extreme Population I stars (3%) to that in extreme Population II stars (0.05%)? NpopI NpopII =

Q: Given the circuit below: If R1 = 3 Ω, R2 = 7 Ω, R3 = 5 Ω, V1 = 8 V, V2 = 4 V, and V3 = 6 V, what is…

A:

Q: 2200 W electric stove operates on a 220 V line.

A: A) direct current will flow. (D/C)

Q: objectand will ine A Mirror is :50cm trom an Produce a 5.0x upright mage. ullet type of mirror is it…

A:

Q: PROBLEM NO. 5 From point A, a projectile is launched with initial velocity v, at an angle 0.…

A:

Q: Consider two current-carrying circular loops. Both are made from one strand of wire and both carry…

A: The correct answer is option (c) i.e. 1/4 times weaker

Q: A convex spherical mirror has a focal length of 39 cm . If an object is placed 24 cm in front of it…

A: Given, Focal length=39cm Object distance=24cm

Q: Potential difference between two points of a wire carrying 20 amperes Current is 1•9 volt .…

A:

Q: Frequency of Vibration and Tension L = 50 cm m * or u = 0. 039- cm f. experimental (Hz) Tension…

A: We know that the frequency of the wave is given as  f = n2LTμ where  μ is the mass per unit length T…

Q: We can tell what molecules are in a distant star by: Group of answer choices a)the star’s…

A: The astronomers use the spectroscopy method to determine the composition of planets and stars.

Q: One end of a 0.33-m copper [k = 390 J/(s·m·C°)] rod with a cross-sectional area of 1.0 × 10-4 m2 is…

A:

Q: A thermometer reading 100 ºF is placed in a medium having a constant temperature of 70 ºF. After 6…

A:

Q: ConstantS By what factor does the pressure change'? ΑΣφ The temperature of an ideal gas is increased…

A:

Q: A stone is thrown straight up from the edge of a roof, 650 feet above the ground, at a speed of 16…

A: Write the given values with the suitable variables. h=650 ftu=16 ft/sa=-32 ft/s2t=5 s Here, h, u, a,…

Q: ball is held 480 cm in front of a plane mirror. The distance between the ball and its image is: 1.…

A: The distance of image from mirror is equal to distance of object from mirror

Q: A uniform disk of radius R=38.0 cm and mass m=3.20 kg is punctured at point O, which is 0.230 R from…

A:

Q: WHAT IS ELECTROPHORESIS AND WHAT ARE THE IMPORTANT APPLICATIONS OF ELECTROPHORESIS?

A: Separation of solutes based on different rates of migration though an electric field through…

Q: How do common types of batteries generate electrical energy? Elaborate your answers.

A: Batteries are made up of two electrical terminals known as the cathode and the anode, which are…

Q: 1)ln a Young's double-slit experiment, both the wavelength and the slit separation are increased by…

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

Q: 1. As shown in the figure, a large open tank contains a layer of oil (density 450 kg/m³) floating on…

A:

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: Converging lens has 14.0 cm focal length. What is the focal length of the diverging lens? 30.0 cm…

A: GIVEN: focal length of converging lens f=14 cm

Q: Part A You and a friend get lost while hiking, so your friend pulls out a magnetic compass to get…

A:

Q: In the figure, initially unpolarized light is sent into a system of three polarizing sheets whose…

A:

Q: Potential difference between two points of a wire carrying 20 amperes Current is 1.•9 volt .…

A: Given data :   Potential difference   =  V    Current   =  i        To find :          Resistance

Q: Two point masses are connected by a stem of 80 cm of negligible mass. The mass on the left has a…

A:

Q: the current through the heating element with time in an iron when it is plugged into a standard 120…

A: The average power is 848.53 W

Q: In the figure below, mA = 1.50 kg and mg = 0.50 kg and the table surface is frictionless. If the…

A:

Q: How far is the second dark fringe to the right of the central bright fringe in the double-slit…

A:

Q: A very myopic man has a far point of 18.0 cm. What power eyeglasses (in diopters, held 1.47 cm from…

A: To correct this defect we have to insure that the far point for the person should be at infinity So…

Q: Give the rest mass (in kg) of a photon with wavelength 648.0 nm.

A:

Q: A car takes 10 sec, to cover a distance of 30 m , and takes 12 sec. to cover 42 m, find the…

A:

Q: You look through a lens with a –100.73 cm focal length at a dog standing on the other side of the…

A:

Q: A rickshaw puller pulls the rickshaw by applying a force of 160 N. If the rickaw moves with constant…

A: Write the given values with the suitable variables. F=160 Nv=108 km/h Here, F is the force and v is…

Q: In the figure below, ma = 1.50 kg and mp = 0.50 kg and the table surface is frictionless. If the…

A:

Q: The brakes are applied to a vehicle with a mass of 1.7 Mg w descending a l-in-9 gradient at a 15 m/s…

A: Given data:-  The mass of the vehicle m = 1.7 Mg = 1.7 x 103 kg  its path slop is 1 in 9 gradient…

Q: In Rutherford’s original experiment, alpha particles (α) were shot toward a gold foil. Gold has an…

A: At closest approach ,kinetic energy is equal to potential energy of the two nucleolus system.

Q: If the annual (8 hours per day) cost to run a 400-W computer is ₱12,000.00, how much does the…

A: Given data:  Daily uses = 8 hours per day Power (P) = 400 W = 0.400 kW Total cost of running…

Q: (1) Current density describes how charges flow through an extended object such as a wire. (II)…

A: Current density is the amount of charge flowing per unit time through unit cross sectional area  of…

Q: Find the mass of water that vaporizes when 4.78 kg of mercury at 203 °C is added to 0.381 kg of…

A: Given data: The mass of mercury is M=4.78 kg. The temperature of the mercury is T=203°C. The mass…

Q: At 20 °C, the surface tension of water is 0.073 N/m. A soap film is holding up the entire weight of…

A: Wire length = 2.2 cm = 0.022 m Wire Diameter = 0.1 cm = 0.001 m Wire radius = 0.001 / 2 Surface…

Q: 32. An electric toaster is rated 1200 watts at 120 volts. What is the total electrical energy used…

A:

Q: In a certain home sound system, two small speakers are located so that one is 80.0 cm closer to the…

A: Given that, Path difference, ΔX = 80 cm = 0.8 m Velocity of sound in air, v = 344 m/s We know that…

Q: How much tension must be developed by the erector spinae with a moment arm of 6 cm from the L5-S1…

A:

Q: Four 1.5-volt AA batteries in series power a transistor radio. If the batteries hold a total charge…

A:

Q: Induttor 10.00 5.00 0.00 -5.00 H 0.00 0.50 1.00 Time (s) x10 Is inductor Voltage leading inductor…

A: The leading or lagging of voltage depends upon what colour represents voltage .

Q: Find the gauge pressure in pascals inside a soap bubble 2.50 cm in diameter. For related…

A: diameter of bubble (d) = 2.50 cm radius of bubble (r) = 1.25 cm Surface tension (T) = 0.0200 Nm

Q: A concave spherical mirror forms a real image 1.36 times the size of the object. The object distance…

A:

Q: The drawing shows a crystalline slab (refractive index 2.115) with a rectangular cross section. A…

A:

Q: 2- Converging meniscus lens (n = 1.5) has a concave surface whose radius is - 20 cm and a convex…

A: Given : n=1.5, R1= -20 cm (negative as concave surface)  R2= +12 cm (positive as convex surface)…

Q: Five people, all about equal masses, are in a perfectly sealed room in which the air conditioner is…

A: Given that,  In a room there are five people. The air conditioner removes heat at the rate of 500…

Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.