Water waves change direction when they encounter water of different depths and begin to move at different wave speeds. this is called
a. reflection
b. constructive interference
c. the doppler effect
d. refraction

What causes the formation of ocean currents?

Photons with the highest energy have the longest period

Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.