已知氦气和氩气的原子量分别为4和40，它们在标准状态嗲的沾滞系数分别为<br /> <img src="https://nimg.ppkao.com/2019-04/wuacheng/2019042416572575968.jpg?sign=b57006e11e28bda3870657b738e03f80&t=62d7543d" /><br /> 求：<br /> （1）氩分子与氦分子的碰撞截面之比<img src="https://nimg.ppkao.com/2019-04/wuacheng/2019042416574447296.jpg?sign=5080bf4e47b828646bd8e58fd0c3f480&t=62d7543d" /><br /> （2）氩气与氦气的导热系数之比<img src="https://nimg.ppkao.com/2019-04/wuacheng/2019042416580069582.jpg?sign=5a4b61d741031a94a4942448b1d1020e&t=62d7543d" /><br /> （3）氩气与氦气的扩散系数之比<img src="https://nimg.ppkao.com/2019-04/wuacheng/2019042416581852487.jpg?sign=1415f8e95a7a26136ad5a49acb94728f&t=62d7543d" />