40 moles of an ideal gas, maintained at a temperature of 500K, has its pressure decreased from 7 pa to 3 pa. If the ideal gas experiences no change in internal energy, what is the change in heat the gas experiences? a)1.41×10⁵
b)2.68×10⁵
c)-1.41×10⁵
d)-2.68×10⁵

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.

The sunlight shines uv radiation on earth,a microwave oven radiates waves on food