题干

平静湖面上传播着一列水面波(横波),在波传播方向上有两小木块,相距10m,随波上下振动,测得小木块每分钟振动20次,当甲木块在波峰时,乙木块恰在波谷,且两木块间有两个波峰,则此水面波的波长为____m,波速为____m/s,频率为____Hz.(用分数表示)
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    Melbourne, Australia

    Melbourne is a hotspot travel destination, and it's easy to see its beautiful beaches and busy city life.

    Why it's a great choice: Australia as a whole is considered a safe destination for international travel, and because of that, many solo travelers go there. As an English-speaking country, you won't be faced with any language barriers. Melbourne is easy to get around because you can walk or bike practically anywhere!

    Thailand

    Thailand is great for solo travelers — perhaps because it is one of the Buddhist mindsets, which promote equality among the sexes.

    Why it's a great choice: Thailand is known for its friendly atmosphere, and as a travel hotspot, there are plenty of chances to meet other like-minded travelers. Well known for being very cheap, especially in the north. A good choice if you want to get away on a budget. Thailand has a lot to offer, from the party- central Bangkok to beautiful beaches and tropical (热带的) jungle.

    Hong Kong, China

    Hong Kong is a great place to relax for solo travelers as it is full of “Zen Moments”, such as beautiful gardens and Tai Chi classes.

    Why it's a great choice: Hong Kong is regarded as one of the safest cities in the world. If you're not well traveled, or perhaps a bit tired of things like language barriers, Hong Kong is a great place to start, as it mixes both Eastern and Western at the same time.

    Bali, Indonesia

    Bali is a spiritual place with yoga, spas, healthy food and beaches. The combination of friendly people and splendid visual culture has made Bali number one tourist attraction.

    Why it's so great: you won't be the only solo traveler in Bali. Everyone is known for being extremely friendly and you're sure to meet some amazing characters along the way. As a Hindu island, Bali is the perfect place for a relaxing and spiritual retreat (静修). The Sacred Monkey Foresting Ubud is fantastic 一 if you like monkeys, anyway.