7. What energy level must most hydrogen electrons start on to show Balmer absorption lines? What spectral class has the strongest Balmer lines? What Temperature does this correspond to? Energy Level Spectral Class Temperature 8. Why do the hottest stars show weak Balmer lines? Why do the coolest stars show weak Balmer lines?

Q: In astronomy, distances are often expressed in light-years. One light-year is the distance traveled…

A: 1 light year is the distance traveled by light in one year. 1 year = 365.25 days            = (…

Q: What is the role of equations in this book?

A: The natural phenomena reveal relationships between the fundamental properties of nature (space,…

Q: What is 91 miles per hour in units of meters per second? Give your answer rounded to 1 digit after…

A: Given,  91 miles per hour We need to, Convert 91 miles per hour in units of meters per second.

Q: Which quadrant corresponds to an angle of 195 degrees?

A: Introduction: Trigonometry is the branch of the mathematics which study the angle and their…

Q: What geometrical shape has the least surface area for a given volume?

A: The geometrical shape has the least surface area for a given volume is sphere.

Q: What is the chemical formula for sulfur dioxide

A: To Determine Chemical Formula of Sulfur Dioxide

Q: What are the applications of calculus at physics?

A: Calculus is a branch of Mathematics which involves the study of rate of change.Calculus is helpful…

Q: If the density of a diamond is 3. 5 g/cm³ , what would be the mass of a diamond whose volume is 0. 5…

A:

Q: If the solar insolation is 1,400 kWh/m² per year. And the efficiency of solar panel is 17%. How much…

A: We are given solar insolation. We are also given the efficiency of solar panel. We hence first find…

Q: If the weight of an object is 726 N, what is the mass of the object?

A:

Q: What is meant by the term 'a base unit'?

A: Base quantity is measured by base unit .This is also called fundamental unit which is not a…

Q: Mass (m): Mechanical Energy (ME) = 1,000,000 J PE = 998,791 J h: v = 1.5 m/s KE: v: 55m v = 31.28…

A: At stage 1: PE = 998791 KE = Total mechanical energy - PE  KE = 1209 J KE = 12mv2 = 1209 m=1074.67…

Q: What is a right handed co-ordinate system?

A: Right handed co-ordinate system is a cartesian coordinate system where the third axis is determined…

Q: A boy uses a string to swing a 2 kg stone around his head. If the string is 1.5m, and can bear a…

A: Given  Tension = 2224N Radius of the swing = length = 1.5 m Mass of the object = m = 2 kg

Q: What is the size in μm of a cell that is 145mm wide in my photo. The scale bar in the photo is 1.7cm…

A: Scale bar is defined as 1.7 cm  long scale = 12 um 1 cm long scale = 121.7 cm 1 cm long scale = 7.06…

Q: please solve this in grade 12 trig and not engineering notation/terminology

A:

Q: A boy uses a string to swing a 3 kg stone around his head. If the string is 22 m and can bear a…

A:

Q: The art in scientific thinking—whether in physics, economics, or engineering—is

A: The art in scientific thinking—whether in physics, economics, or engineering—iswe need to fill it up

Q: An object of mass 10 kg moving at a speed of 5 m/s collides with a ball of mass 4 kg moving in the…

A: To solve the question, we need to find the speed of the 2nd ball after the collision. Using the…

Q: The amount of heat needed to reduce the temperature of 1.5 kg of water from 5°C to 15°C is (note…

A: The initial temperature is T1 = 5 C The final temperature is T2 = 15 C mass of water m = 1.5 Kg…

Q: what is physics and its advantages?

A:

Q: E1.A horizontally directed force of 25.0 N is used to pull a box a distance of 1.5 m across a…

A: Dear Student,   As per our company policy, I am allowed to answer only first 3 subparts. So, kindly…

Q: /hat is the least count?

A: The least count of a measuring instrument is the smallest and accurate value in the measured…

Q: Suppose you made 5 measures of your walking stride and got the following values: 0.76 m,  0.77 m,…

A:

Q: If a body has a mass of 20 g and a volume of 5 cm3 , what is its density ?

A:

Q: dropped a 2kg rock from a cliff and it hits the ground 2 seconds later. How high is the cliff?   5m…

A: Given data, Rock is dropped from cliff i.e., initial velocity is zero, u=0 Only acting acceleration…

Q: It is estimated that about 40.0 m² of solar panel is needed to provide electricity for an average…

A:

Q: Is the only standard unit in the metric system that has a prefix. what does this prefix means?.

A: Yes. A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple…

Q: A certain wind turbine has a nameplate capacity of 2 MW. If the average capacity factor is 41%, how…

A: Given value--- nameplate capacity of wind turbine = 2 MW. capacity factor = 41 %. We have to…