The first atomic bomb yielded an amount of energy equivalent to 17 kilotons of T

Question

The first atomic bomb yielded an amount of energy equivalent to 17 kilotons of TNT. Estimate the mass converted into energy in this event. 1 ton of TNT is equivalent to 4 billion Joules.

a) 20 kilotons b) 0.1 kilotons c) 1 kg d) 1 g e) 1 mg

A neutral atom designated as 4018X contains

a) 20n and 20p b) 22n and 18p. c) 18p and 22n. d) 18p and 40n e) 40p and 18n

Why is it hard to use Carbon dating for rocks?

a) The half-life of 14C is too short. b) The decay constant for 14C is too large c) Carbon is not absorbed from the atmosphere in rocks very efficiently. d) All of the above.
a) 20 kilotons b) 0.1 kilotons c) 1 kg d) 1 g e) 1 mg

A neutral atom designated as 4018X contains

a) 20n and 20p b) 22n and 18p. c) 18p and 22n. d) 18p and 40n e) 40p and 18n

Why is it hard to use Carbon dating for rocks?

a) The half-life of 14C is too short. b) The decay constant for 14C is too large c) Carbon is not absorbed from the atmosphere in rocks very efficiently. d) All of the above.

Explanation / Answer

a. E= mc^2

m =17000* 4*10^9/9*10^16

m=1 kg

b. 18 protoins and 22 neutrons

c.all the above

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