How much heat is needed to raise the temperature of 100 g of water by 50 c, if the specific heat of water is 4,184 j/kg. c?

Heat required to raise the temperature of water is given as

here we have

m = 100 g = 0.100 kg

s = 4183 J/kg C

now we can use the above equation

so here it requires 20920 J heat to raise the temperature of 100 g water by 50 degree C

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq

the answer is c.)

explanation: