The answer is b because if you’re fan is blowing and you spend it the opposite way, the air will be cooler
After 100years, sample is 250g
After 200 years, sample is 125g
After 300years, sample is 62.5 g
To change only one variable which is very important than to test the experiment to match the hypothesis again, I think. It’s been a while since I was on that lesson♀️
In order to emit electrons, the cesium will have to absorb photons. Each photon will knock out one electron by transferring its energy to the electron. Therefore, by the principle of energy conservation, the energy of the removed electron will be equal to the energy of the incident photon. That energy is calculated using Planck's equation:
E = hf
E = 6.63 x 10⁻³⁴ * 1 x 10¹⁵
E = 6.63 x 10⁻¹⁹ Joules
The electron will have 6.63 x 10⁻¹⁹ Joules of kinetic energy
Answer:
Here boron-11 means the name of the element is boron and the mass number is 11
Explanation:
