1、可知:T = 4s,λ = 4m,V= λ/ T = 1m/s;
2、PR = 6m,P点振动传到R要时间 t1 = PR/V = 6S;
3、t=0时P点是向下振动,故要R第一次到峰还要时间 t2 = 3T/4 = 3S
4、故P传到R且R第一次达峰时间为(t1 + t2)=9S;
5、R路程 = 5cm*3 = 15cm
1、可知:T = 4s,λ = 4m,V= λ/ T = 1m/s;
2、PR = 6m,P点振动传到R要时间 t1 = PR/V = 6S;
3、t=0时P点是向下振动,故要R第一次到峰还要时间 t2 = 3T/4 = 3S
4、故P传到R且R第一次达峰时间为(t1 + t2)=9S;
5、R路程 = 5cm*3 = 15cm