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Given below are certain facts about radioactivity. Identify the correct one(s). A. Marie and Pierre Curie discovered radioactivity. B. The term “radioactivity” was given by Henri Becquerel. C. Henri Becquerel also discovered radioactive elements, radium and polonium.
A radioactive atom decays 10% of radioactivity in every 40 minutes. If the current radioactivity of the atom is 35 curie, find what will be its reactivity after 2 hours?
With reference to the radioactivity, which of the following statements is/are correct? 1. Radioactivity is a nuclear property. 2. Hydrogen bomb is prepared on the principle of nuclear fission. Select the correct answer using the given below.
A resistance R is measured using the connection shown in the below figure. The current measured is 10 A on ranges 100A and the voltage measured is 125 V on 150 V range. The scales of the ammeter and voltmeter are uniform. The total number of scale divisions of the ammeter is 100 and that of the voltmeter is 150. The scale division can be distinguished. The constructional error of the ammeter is ± 0.3% and that of voltmeter±0.4%. The resistance of the ammeter is 0.25 Ω. The possible error in the measurement of R is?
Two sides of a rectangle were measured. One of the sides (length) was measured 10% more than its actual length and the other side (width) was measured 5% less than its actual length. The percentage error in measure obtained for the area of the rectangle is :
240 radioactive grams of goo loses half its radioactivity every 10 days. How many grams of radioactive goo is left in 40 days?
Who discovered radioactivity?
Radioactivity of an isotope is expressed in
Radioactivity is a phenomenon of the spontaneous emission of
The unit of radioactivity is