Tell me if i’m right and answer the two last ones and you

Which of the following is not an effect of land substance

[ou.01]which of these is the most likely use of an electromagnetic wave which has wavelength shorter than microwaves but longer than visible light? o heat food safely o neat food safely o take images of bones and teeth o transmit radio and cellular phone signals o take images of bones and teeth o transmit radio and cellular phone signals o detect the location of objects which emit heat

Equilateral triangle pbj is inscribed in a circle as shown. determine the measure of arc pjb.