A.图甲,分别用大小相同的力敲击四个装水的瓶子,产生的声音音调相同 |
B.图乙,医生用听诊器判断患者的情况,利用了声音传递能量 |
C.图丙,逐渐抽出玻璃罩内的空气,听见闹铃声越来越小,推理得出真空不能传声 |
D.图丁,禁止鸣笛是在传播过程中减少噪声 |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2