According to our best astronomy, the observable universe is about 91 billion light years in diameter. What is the diameter of the observable universe in gigametres?

Q: If you travel 1 mile at 1 meter/sec and then travel another 1 mile at 2.6 meters/sec, how long did…

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Q: Anything that has mass and occupies space is defined as___________.

A: Matter is anything that has mass and occupies the space. Examples: Table, pen, clouds, etc.

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

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

Q: The half-life of carbon-14 is 5730 years. If 6.25% of the original sample remains, how old is the…

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Q: After you have worked out at the gym on a stationary bike for 46 minutes, the distance gauge…

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Q: If you ran 5,890 meters, how many miles did you run? 1 meter = 3.281 feet 5280 feet = 1 mile

A: The distance traveled by a person is given as, d=5890 m

Q: for any wave, the speed equals the wavelength times the frequency. If a photon of visible light has…

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Q: What is the wavelength of a wave that has a frequency of 1 Hz and travels at 300,000 km/s?

A: Given information: Here, f is the wave’s frequency, and v is the wave’s speed.

Q: How long will it take to drive 1,300 km at 100 km per hour, if you take a one-hour break after every…

A: starting the journey at 100 km/h it will go  in 5 hour : 100x5 = 500 km then take a break for 1 hour…

Q: How long will it take to drive 2,185 km at 95 km per hour, if you take a one-hour break after every…

A: Total time taken if don't takeany rest = distance /speed = (2185 km) /(95 km/hr) = 23 hr

Q: If the speed of light is given as  299,792,458 meters per second and the wavelength is 478 nm.  what…

A: Given velocity of light c = 299,792,458 m/s wavelength of light λ= 478 nm we have to calculate the…

Q: A light year is a measurement of

A: A light year is the measurement of distance. Light-year unit is used in astronomy to measure the…

Q: The number of stars in the Milky Way Galaxy is approximately

A: Number of stars in Milky way galaxy

Q: In astronomy, a unit of distance is used called the Astronomical Unit. It is the average distance…

A: The given values with suitable variables are listed below. Here, c denotes the light speed and d…

Q: If the intensity of visible light from a flashlight is 8 millilumens at a distance from the source…

A: Given:- intensity of visible light (I1)=8 millilumensdistance from the source(D1)=5 feetlet the…

Q: 1 million kilometers can be expressed in scientific notation as:  10x10^6 km  10x10^-6 km none of…

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Q: Find the approximate mass of the dark and luminous matter in the Milky Way galaxy. Assume the…

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Q: The actual average earth-moon distance is about 384,000km, and earth's diameter is about 128,800km.…

A: Given value--- Earth moon distance = 384000 km. Earth diameter = 128800 km. We have to find---…

Q: How long would it take a space craft that was traveling at a speed of 61,079 km/hr to travel a…

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

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Q: A parsec is an astronomical unit of distance where 1 parsec = 3.26 light years (1 light year equals…

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Q: If the Sun's mass is about average, how many stars are there in the Milky Way galaxy? The mass of…

A: Given: The mass of the Sun is of the order of ms=1030 kg, The mass of the Milky Way galaxy is of…

Q: If chikana walks at 4 mph, he covers a certain distance. If he walks at 9 mph, he covers 7.5 miles…

A: Given data: Speeds: v1=4 mph; v2=9 mph Distance, d2=7.5 mi

Q: If the Sun's mass is about average, how many stars are there in the Milky Way galaxy? The mass of…

A: Given, Mass of galaxy = 1042 kg Mass of sun = 1030 Kg

Q: How long would it take in seconds to travel a distance of 2000 meters if you are traveling at a…

A: Write the expression for time taken, and substitute 2000m for d, and 25m/s for v in the below…

Q: One nanometer is equal to: A. 10-6 m B. 10-8 m C. 10-9 m D. 10-5 m

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Q: If the speed of light is 3.00  105 km/s, how many kilometers are in a light-year?    How many…

A: Light year is the distance covered by light in a year. Number of kilometers are in a light-year,…

Q: If a car travels 792 feet in 12 seconds what is the speed of the car in miles per hour ?

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

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Q: How many meters above the ground is an airplane flying at an altitude of 2,000 feet?

A: Given , altitude = 2000 feet. So height in meter = 0.3048× height in feet So height or altitude from…

Q: A 50 kilogram ice skater glides across the ice in a straight line at 7 meters per second. If she…

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Q: How many possible microstates are there for 6 molecules to fit in 6 boxes, when 4 molecules are…

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Q: Sphere A has a mass of 3,450,818kg and sphere B had a mass of 293,183kg. If the magnitude of the…

A: Given, m1=3450818 kg m1=293183 kg F=6.8 N

Q: Suppose you are designing a proton decay experiment and you can detect 50 percent of the proton…

A: In a proton decay experiment 50 percent of proton decay in a tank of water is detect.

Q: One nanometer is: A) 10-11 m B) 10-10 m C) 10-8 m D) 10-9 m

A: Nanometer is a unit of length in the metric system. A nanometer is one billionth of a meter.

Q: If a wave has a wavelength of 15m and a frequency of 1.500 KHz, what is its speed?

A: Given that, The wavelength of a wave, λ=15 m Frequency of a wave, f = 1.5 kHz We need to find the…

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

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Q: Quincy rides his bicycle 1 mile in 4 minutes, and his sister Marissa runs 13, 376 feet in 16…

A: Given Data: The distance covered by Quincy is, d1=1 mile The time required to cover Quincy rides is,…

Q: What is the speed of a wave that has a wavelength of 0.00038 meters and a frequency of 2 MHz?

A: Given that λ=0.00038 mf=2 MHz=2×106 Hz

Q: The distance from the Earth to the Sun is 149,600,000 kilometers. Write that distance in scientific…

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Q: How do we write one hundred nano- (100 times one-billionth)? 102 ✕ 10−9 = 10   We write ten…

A: One hundred milli- 102×10-3=10(2-3)=10-1=0.1 One hundred micro- 102×10-6=10(2-6)=10-4=0.0001 Ten…

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.