Question

几个sat2 物理问题

1. the reason an observer cannot detect the wave nature of fast moving truck is
a. the momentum of the truck is too large.
b.the frequency is too low.
c.the wavelengths are too small.
2. a car driving along a level road at a constant 60km/hr. the force acting on the car from the tires of the car is
a. the normal force times the coefficient of friction
b. less than the normal force times the coefficient of friction.
3. the droplets of water at the top of a building fall at an interval of 1 second. the distance between two consecutive drops of water
a. increase in a linear manner
b. increase in a parabolic manner
4.the critical angle for a beam of light passing from a diamond into air is 24.4 degree. this means that any light rays that strike the surface interface between the dismond and the air with an angle less than 24.4 degree are
a. completely reflected
b. partially relected and partially refracted.
求答案解释

Answer 1

1、为何一辆快速运动的卡车的波动性无法被观测者察觉？
答：c，波长太小

2、一辆轿车以60km/h的速度在水平道路上匀速行驶，轮胎施加于轿车的力是：
答：a，法向力（即重力）乘以摩擦系数

3、楼顶上水珠以1秒间隔滴下，相邻两个水珠的距离：
答：a，线性递增

4、光线从钻石进入空气的临界角是24.4度，这意味着光线如果以小于24.4度的入射角通过钻石和空气接触面，那么：
答：b，部分被反射部分被折射

追问

能再解释一下1题吗

追答

第1题之前我写错了，应该是c，波长太小，可参考有关波粒二象性的相关描述。

追问

妈的，肯定是答案错了，我和你的答案是一样的，让我纠结半天

追答

标准答案是什么？我也想参考一下，谢谢！