20. Henri Becquerel expected to see only weak images on the photographic plate containing the uranium salt because he thought
O fluorescent minerals needed direct sunlight to produce radio waves.
O fluorescent minerals needed direct sunlight to produce X-rays.
O fluorescent minerals needed direct sunlight to produce microwaves.
O fluorescent minerals needed direct sunlight to produce gamma rays.

the answer is barium and copper bromide

може ли да зареждате повече информация, моля

the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .

gas and precipitate r the correct answers