destinysmithds7040 destinysmithds7040

17-01-2022
Biology

contestada

4 PTS

What percent of uranium-235 remains after 1420 million years?

A)

12.5%

B)

25%

C)

40%

D

75%

Respuesta :

chibabykalu16 chibabykalu16

19-01-2022

Answer:

B) 25% but to be exact 24.7%

Explanation:

The halflife of 235U is 704 million years. 1420 million years is approximately two halflives, so about 24.7% would be remaining.

Answer Link

Otras preguntas

During a laboratory experiment, when may you wear contact lenses?

Can someone help me with these ?

What is the answer to question 5

The neighborhood in the photo above is an enclave. In which of the following cities might we find this neighborhood? A. Shanghai, China B. Beijing, China C. Lon

Which of the following was a direct cause of job specialization in early human civilizations? A. Development of agriculture B. Establishment of trade net

If the numbers on the spring scales read 200 g. What property of the shoes is being measured? A) mass B) volume C) length D) temperature

The probability that a fair coin tossed 10 tines will land heads up on all ten tosses is 1 out of

Leticia: ¿Qué ____________ ustedes ayer? Marc y Pedro: Fuimos a la playa, nadamos mucho y después vimos una película. hiciste hicimos fuimos hicieron

Egally, mandated reporters need to report any suspicion of abuse to______ choose one answer. a. the child's school social worker. b. the child protection hotl

Which statement contains an ironic use of understatement? A) The boys were so exhausted after the long flight that they slept for hours. B) We watched the