You have 400 g of a radioactive sample with a half-life of 20 years. How much is left after 50 years?   > 81 kg   79 kg   75 kg   71 kg   < 69 kg

Q: Hi, my problem is this: The diagram shows a crate with mass m=36.3kgm=36.3kg being pushed up an…

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Q: In step 3, I am struggling to see the numbers. So if I'm corren the answer is 7?

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Q: cientists observe a distant galaxy with a spectrometer. They find that the wavelength of the Lymann…

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Q: Given the wavelength, find the frequency in Hz 789 nm 1.09x10^-5 m

A: Given:- The wavelength of a wave is  1) λ1 = 789 nm  2) λ2= 1.09×10-5 m Find:- The frequency of the…

Q: Point A in (Figure 1) is 4.5 mm from the wire. Assume that the wire is very long and that all other…

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Q: (7) A person walks at a rate of 3.10 m/s 40.0° south of west. (a) sketch a drawing showing this…

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Q: A 9.0-m-long string is wrapped around a pulley that is free to rotate a pulley that is free to…

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Q: A NASA scientist calculates that the momentum of 45.5 kg space probe as it leaves our solar system…

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Q: 1. Knight P10.7 What height does a frictionless playground slide need so that a 35 kg child reaches…

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Q: I really need help with PART A AND PART B, CAN YOU LABEL THEM AS WELL

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Q: 2) Calculate the magnitude and direction of the Coulomb force on the -2 µC charge due to the other…

A: The resultant force F=110.7 N

Q: A small, square loop carries a 40 A current. The on-axis magnetic field strength 41 cm from the loop…

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Q: Use Super Position theorem to find the current flowing through Resistance(Rf) and also voltage…

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Q: A particle has a mass of 1.6E-27kg and a momentum of 2.2E-18 kg.m/s. What is the speed of the…

A: Given:      Mass of particle(m) = 1.6×10-27 kg     Momentum of particle(p) = 2.2×10-18 kg.m/s

Q: Examine the acceleration data of the cart and holder when weights are added to it. sensor cart &…

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Q: 1-what the difference between the aluminum in thermal conductivity sample and the copper sample.

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Q: With what initial speed (in given units) does the skateboarder need to barely clear the pool?

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Q: The power radiated by the sun is 3.9 x 1026 W. The earth orbits the sun in a nearly circular orbit…

A: Determine the intensity radiated by the Sun. I=PAI=P4πR2I=3.9×1026 W4π(1.5×1011 m)2I=1379.34 W/m2

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Q: What will happen to the intensity pattern if a shorter wavelength light source is used?

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Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.